Studied by 1 person
Looks like no one added any tags here yet for you.
What is homeostasis?
Maintenance of a constant internal environment
What are the examples of homeostasis?
Body water, content, and body temperature
What does a coordinated response require?
Stimulus receptor and an effector
Where is the body temperature maintained and controled
Thermal regulatory center In the base of the brain as blood passes through
How’s the volume of water loss in a production of urine can be controlled
The forms of the kidneys container structures called collecting ducts for which filtrate passes on its way to the bladder. Water can be resorbed as it passes along collecting ducts And the hormone called ADH controls this process
How are organisms able to respond to changes in the environment?
Through nervous and endocrine systems
What is phototropism?
Plants growing in response of light
What is geotropism?
Plants growing in response to gravity
What are negative and positive tropisms
Is the growth is towards the stimulus the tropism is positive and if the growth is away from the stimulus, it’s negative
What does the The role of auxin
It’s a growth hormone, which coordinates and controls directional growth responses such as geotropism and phototropism
What are the differences between nervous and endocrine systems?
Nervous system sends electrical impulses while endocrine system, chemical hormones, nervous system travel through nerves and neurons well endocrine system through bloodstream, and the effectors of nervous systems are muscles and glands and endocrine system, target cells in specific tissues, nervous system act, faster than endocrine system, and length of affect of nervous system is short, but the endocrine system long
What does the central nervous system consist of?
Brain and spinal cord
What is the role of Neurotransmitters at synapses
An impulse arrives at the end of presynaptic neuron, vesicles move towards and fuse with the presynaptic membrane which releases neurotransmitters into the synaptic cleft they diffuse across the synaptic cleft and attach to receptors at the postsynaptic membrane, which trigger a new impulse
What is the order of the reflects arc
Stimulus, sensory neuron relay neuron, motor neuron, effector, and response
What is the function of the cornea of the eye?
Transparent lens that reflects light as it enters the eye
What is the function of the iris of the eye?
Controls how much light enters the pupil
What is the function of a lens?
Transparent desk that can change shape to focus slide into the retina
What is the function of the Retina the eye?
Contains light receptor cells which are rods and cons
What is the function of the optic nerve?
Censoring neuron that carries impulses between the eye and the brain
What is the function of the pupil?
Hole that allows light to enter the eye
What are the rods receptors cells?
Cells which are sensitive to light
What are the cons receptor cells?
Receptor cells that can detect color
What happens to the ciliary muscles and suspensory ligaments when the object is close up
The ciliary, muscles contract, and the suspensory ligaments loosen
What does the lens do when the object is close-up?
The lens becomes fatter, so the light is refracted more
What are the ciliary, muscles and suspensory ligaments do when an object is far away?
the ciliary muscles relax, and the suspensory ligaments are pulled tight tight
What does the lens do when an object is far away?
It becomes thinner so the light is refracted less
What happens to the radial muscles, the circular muscles and the pupil when the light is dim?
The circular muscles relax, the radial muscles contract, and the pupil becomes dilated
What happens to the radial muscles, the circular muscles and the pupil when the light is bright
the radial muscles relax, the circular or muscles contract, and the pupil becomes constricted
What is the source of adrenaline?
Adrenal gland
What is the source of insulin?
Pancreas
What is the source of Testosterone
Tests
What is the source of progesterone?
Ovaries
What is the source of oestrogen?
Ovaries
What is the role of adrenaline?
Prepares the body for the flight or fight response
What is the Role of insulin
Lowers blood glucose levels
What is the role of testosterone?
Main sex hormone in males
What is the role of progesterone?
Maintains pregnancy
What is the role of oestrogen?
Main sex hormone in females
What is the effect of adrenaline?
Increases heart rate and breathing rate
What is the effect of insulin?
Causes excess glucose in the blood to be taken up by the muscles
What is the effect of testosterone?
Development of male reproductive organs and secondary sexual characteristics
What is the fact of progesterone?
Maintains the uterus lining to cushion, the fertilized egg and allow it to develop
What is the effect of oestrogen
Development of female secondary sexual characteristics and regulations of the menstrual cycle
