Organism Level Systems

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156 Terms

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ADH

A hormone secreted by the pituitary gland which increases water reabsorption in the kidney (making the kidney tubules more permeable to water)

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Adrenaline

  • A hormone released by the adrenal gland which increases heart rate and breathing rate (involved in fight/flight).

  • It also raises blood sugar levels by increasing the conversion of glycogen into glucose

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Auxin

A plant hormone that is responsible for cell elongation

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Central Nervous System (CNS)

The brain and the spinal cord

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Cerebellum

The region of the brain that controls unconscious functions such as posture, balance, and muscular movement

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Cerebral Cortex

The outer layer of the cerebrum

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Cerebrum

  • The highly folded region of the brain that is responsible for controlling voluntary actions such as learning, personality, and memory.

  • It is divided into the right and left hemispheres

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Ciliary Body

  • An extension of the iris

  • It contains the ciliary muscle which can contract or relax allowing the eye to focus

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Colour Blindness

A condition where a person has a defect in the receptors or a lack of receptors in the retina

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Contraception

Methods that are used to prevent pregnancy

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Cornea

The part of the eye that refracts light as it enters, focusing it onto the retina

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Dormancy

  • A period of time in which seeds hibernate

  • This stops when they germinate

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Effector

A gland or muscle that produces a response to the stimulus to restore optimum conditions

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Endocrine Glands

A group of cells that are specialized in secreting chemical (hormones) directly into the bloodstream

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Endocrine System

A chemical messenger system that releases hormones directly into the bloodstream to control metabolism, development, growth, and reproduction

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Ethene

A plant hormone that promotes fruit ripening

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Follicle Stimulating Hormone (FSH)

  • A female reproductive hormone that is released by the pituitary gland

  • It is responsible for the maturation of an egg in the ovary

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Geotropism

The growth response of a plant to gravity

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Germination

The process by which seeds develop into plants

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Gibberellins

Plant hormones that initiate germination and flowering

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Glucagon

  • A hormone produced by the pancreas which works with insulin to control blood sugar levels.

  • It increases blood glucose concentration by converting glycogen into glucose

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Herbicide

A type of pesticide used to kill unwanted plants (weeds)

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Homeostasis

  • The maintenance of a stable internal environment in the body despite fluctuations in internal and external conditions

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Hormone

A chemical messenger secreted by the endocrine glands into the bloodstream and transported to receptors on target organs

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Hypothalamus

The part of the brain that is the regulation center for temperature and water balance of the body

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Infertility

The inability to reproduce after 12 months or more of unprotected sex

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Insulin

  • A hormone produced by the pancreas which controls the body’s blood sugar levels

  • It works to decrease glucose levels

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In Vitro Fertilization (IVF)

  • The fertilization of an egg using sperm outside of the body

  • IVF is used when a couple are having difficulty conceiving

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Iris

The part of the eye that contracts or relaxes to control the amount of light entering the eye

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Kidney

The organ in the body that maintains water balance and produces urine

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Lens

A part of the eye that further refracts light to focus it onto the retina

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Long-Sightedness (Hyperopia)

A defect of the eye where distant objects appear out of focus due to the convergence of light rays in front of the retina

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Luteinizing Hormone (LH)

A female reproductive hormone released by the pituitary gland that stimulates the release of an egg

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Medulla

The part of the brain responsible for non-voluntary movement such as breathing rate and heart rate

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Menstrual Cycle

The monthly cycle in women that involves the development of the uterus lining, ovulation, maintenance of the uterus lining and it shedding

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Motor Neuron

The neuron that transmits impulses from the relay neuron to the effector to produce a response

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Negative Feedback System

A system which works to reverse the initial stimulus

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Nephron

A kidney filtering unit

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Estrogen

A female sex hormone produced in the ovaries that regulates the menstrual cycle and controls the development of secondary sexual characteristics

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Optic Nerve

The nerve that carries impulses between the brain and the eye

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Osmosis

The net movement of water molecules from a region of high water concentration to a region of low water concentration across a partially permeable membrane

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Osmotic Lysis

When water moves into an animal cell causing it to burst

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Osmotic Shrinking

When water moves out of an animal cell causing the cell to shrink

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Parthenocarpic Fruit Development

The development of seedless fruit

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Phototropism

The growth response of a plant to unilateral light

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Pituitary Gland

The gland that stores and releases hormones which regulate many bodily functions

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Progesterone

The hormone that maintains the uterus lining during the later stages of the menstrual cycle and pregnancy

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Pupil

A hole in the center of the iris

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Receptor

A cell or organ that recognizes the stimulus

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Reflex Arc

The pathway of neurons involved in a reflex action

<p>The pathway of neurons involved in a reflex action</p>
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Relay Neuron

The neuron that transmits electrical impulses from the sensory neuron to the motor neuron

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Renal Artery

The blood vessel that provides the kidney with blood

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Renal Vein

The blood vessel that takes blood away from the kidney

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Retina

The layer at the back of the eye that contains light receptors and is sensitive to light

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Root Cuttings

A method of cloning plants in which a root is cut from a parent plant and replanted in compost

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Rooting Powder

  • A powder that contains auxins

  • The cut root is dipped into this before being replanted (during root cuttings)

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Sensory Neuron

The neuron that detects the stimulus and transmits the electrical impulse to the relay neuron located in the spinal cord

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Short-Sightedness (Myopia)

A defect of the eye where distant objects appear out of focus due to the convergence of light rays in front of the retina

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Suspensory Ligaments

Attach the lens to the ciliary muscle

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Synapse

The junction between two neurons (nerve cells)

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Testosterone

The male reproductive hormone that controls sperm production and the development of the secondary sexual characteristics

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Thyrozine

  • A hormone released by an endocrine gland (thyroid gland) that controls the metabolic rate and the rate of glucose uptake during respiration

  • It also promotes growth

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Tissue Culture

A method of cloning plants where plants are grown in a growth medium containing many nutrients

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Type 1 Diabetes

A condition in which the pancreas fails to produce insulin resulting in high blood sugar levels

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Type 2 Diabetes

A condition in which a person develops insulin resistance or doesn’t produce enough insulin

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Urine

  • Liquid produced by the kidneys to help maintain water balance

  • It contains mineral ions, water, and urea

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Vasoconstriction

The constriction of blood vessels

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Vasodilation

The dilation of blood vessels

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Water Potential

  • A measure for the tendency of water to move from one area to another

  • It is represented by the Ψ (Psi)

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Brain and the Spinal Cord

The central nervous system (CNS) consists of the ___ and ___

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Central Nervous System (CNS)

It allows us to make sense of our surroundings and respond to it in order to survive

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Receptor cells

(How the Nervous System Coordinates Responses)

___ ___ convert a stimulus (such as a bright light) into an electrical impulse

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Sensory Neurons

(How the Nervous System Coordinates Responses)

This electrical impulse travels along cells called ___ ___ to the central nervous system (CNS)

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Electrical Impulse

(How the Nervous System Coordinates Responses)

Here, the information is processed and the appropriate response is coordinated, resulting in an ___ ___ being sent along motor neurons to effectors

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Effectors

(How the Nervous System Coordinates Responses)

The ___ carry out the response (this may be muscles contracting or glands secreting hormones)

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Reflex Arc

  • A subconscious response to a dangerous stimuli, such as a hot surface

  • Sometimes an extremely quick response is needed and there is not enough time for it to go through the conscious portion of brain so the CNS is involved instead

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Stimulus

(Reflex Arc)

  • A ___ is detected by receptors, such as thermoreceptors in fingertips detecting heat

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Impulses

(Reflex Arc)

___ are sent along a sensory neuron

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Relay neuron

(Reflex Arc)

In the CNS the impulse passes to a ___ ___

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Motor Neuron

(Reflex Arc)

Impulses are sent along a___ ___

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Effector

(Reflex Arc)

The impulse reaches an ___ resulting in the appropriate response, such as a contraction of the biceps to move the arm away from the heat source

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Cornea

(Structures of the Eye)

  • The transparent outer part of the eye

  • It refracts light to reach the retina

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Iris

(Structures of the Eye)

  • The colored part of the eye that does not allow light to go through

    Controls how much light enters the eye

  • In bright light, the circular muscles contract and radial muscles relax to make the pupil smaller, avoiding damage to the retina

  • In dim light, the circular muscles relax and the radial muscles contract to make the pupil larger, so more light can enter to create a better image

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Lens

(Structures of the Eye)

  • Transparent, biconvex disc that attaches to ciliary muscles by the suspensory ligaments

  • Focuses light onto the retina

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Retina

(Structures of the Eye)

  • Contains light receptors

  • Contains rods (respond to dim light) and cones (respond to color)

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Optic Nerve

(Structure of the Eye)

  • Carries impulses between the eye and the brain

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Color Blindness

(Eye: Common Defects)

  • The inability to tell the difference between different colors due to the lack of or defects in the receptors in the retina

  • It is an inherited condition and the most common form is red-green color blindness

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Myopia (Short-Sightedness)

(Eye: Common Defects)

  • The ability to see near objects but not distant objects, due to the lens focusing the image in front of the retina.

  • They are treated by concave lenses in glasses

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Hyperopia (Long-Sightedness)

(Eye: Common Defects)

  • Ability to see distant objects but not near objects, due to the lens focusing the image behind the retina

  • They are treated by convex lenses in glasses

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Cerebrum

(Structure of the Brain)

  • Functions

    • Intelligence

    • Vocabulary

    • Personality

    • Conscious Thought

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Cerebrum

(Structure of the Brain)

  • Features

    • The largest part of the brain and divides into 2 cerebral hemispheres

    • Each half processes the information it receives from the opposite side of the body

    • The outside is made from grey matter (containing myelinated nerves) and the inside is made of white matter

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Cerebellum

(Structure of the Brain)

Coordinate voluntary body movements and help with balance

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Medulla

(Structure of the Brain)

Control center for heart rate, blood pressure, and breathing rate

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Hypothalamus

(Structure of the Brain)

Control temperature and water balance in the body through the hormonal system

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Pituitary gland

(Structure of the Brain)

An important gland releasing hormones, such as growth hormone into the blood

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Endocrine System

  • Hormones are chemical messengers that are secreted by endocrine glands into the bloodstream, where they are transported around the body to receptors on the target organ

  • The pituitary gland, mentioned before, it one of the most important glands

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Adrenaline

  • Produced by the adrenal glands that sit on top of kidneys

  • Targets many different organs, such as the heart and lungs

  • Responsible for the ‘fight or flight’ response for survival

    • Increases heart rate, dilates pupils, makes hairs stand erect, increasing breathing rate

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Thyroxine

  • Produced by thyroid gland in the neck

  • Responsible for controlling metabolic rate, meaning it controls how quickly oxygen and food react to release energy. It is therefore responsible for growth.

  • Example of negative feedback

    • If ___ levels are too low it stimulates the hypothalamus to produce a hormone called TRH and the pituitary then releases TSH (thyroid stimulating hormone) which causes the thyroid to produce more ___.

    • When the levels are returned to normal these hormones are inhibited to stop further increases.

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Hormones

___ are responsible for controlling puberty and also the menstrual cycle

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Testosterone

(Puberty)

  • Produced by the testes, are responsible for the development of sperm and also secondary sexual characteristics in males, such as deepening voices and increased hair.