Health Midterm 2023

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What does your nervous system do for you?

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Test Date: January 17th, 2023

Health

11th

85 Terms

1

What does your nervous system do for you?

The nervous system is responsible for regulating your body temperature, sending signals to the brain through nerves, and controls movement. It is the master control and communication system of our body.

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Parts of the Nervous System

Brain, Spinal Cord, Nerves, Sensory Organs(5 senses)

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Functions of the Nervous System

Sensory Input, Integration, Motor Output

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Sensory Input

Stimuli; noticing things

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Integration

Process of carrying out information by your CNS; translating what you notice

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Motor Output

Muscle/Gland; Using bodily movements to control movement

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Central Nervous System (CNS)

-Made up of the brain and spinal cord

-Acts as the bodyā€™s control center and coordinates bodily activities

-Acts as the integration and command center

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How does the CNS act as the bodyā€™s control center?

Impulses travel through the neurons in your body to reach the brain

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What is the primary function of CNS?

  • Takes in conscious and unconscious thoughts

  • Makes decision for controlling and maintaining homeostasis

  • Asks as integration as a command center

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Peripheral Nervous System (PNS)

  • Made up of everything else (nerves/nerve endings) that carry messages to and from the CNS

  • Carries Impulses to and from CNS to glands and muscles

  • Links all parts of the body by carrying impulses from the sensory receptors to the CNS and from the CNS to glands or muscles

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What are the two main parts of the PNS?

Somatic Nervous System & Autonomic Nervous System

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Somatic Nervous System

  • Relay info between the skin, skeletal muscles and CNS

  • You consciously control this pathway by deciding whether or not to move muscles (except reflexes)

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Autonomic Nervous System

-Relay info from CNS to organs

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Reflexes

automatic response to stimuli

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Involuntary

You do not consciously control these

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Sympathetic Nervous System

control in times of stress such as flight or fight

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Parasympathetic Nervous System

  • controls body in times of rest

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<p>PNS DIAGRAM</p>

PNS DIAGRAM

look at pic

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19

Sensory Division (AFFERENT)

The division of the PNS composed of nerves that carry information TO the CNS

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Motor Division (EFFERENT)

The division of the PNS composed of nerves that carry information FROM the CNS

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Neurons

Nerve cells

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Dendrites

Fibers that receive and convey messages to the cell body of a neuron

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Cell Body

Metabolic center of the cell; contains the nucleus

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What are the two cell types?

Support Cells aka neuroglia and neurons

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What is the job of the Supporting Cells/Neuroglia?

To insulate, support, and protect delicate neurons

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Axon Terminal

  • At their terminal end axons branch into hundreds or thousands of axon terminals

  • Each contains vesicles or sacs of neurotransmitters

  • When a nerve impulse reaches an axon terminal it stimulates the release of neurotransmitters

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Synapse

The junction between neurons

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What are synapses used for?

  • Neurotransmitters diffuse across the synapse to continue cell to cell communication

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Tracts

Bundles of nerve fibers in CNS

White Matter: Myelinated Axons

Grey Matter: Unmyelinated Cell Bodies

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How are neurons classified?

  • Sensory Neurons, Interneurons, Motor neurons

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Sensory Neurons

  • carry impulses from receptors such as the skin to the CNS

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Interneurons

connect sensory and motor neurons in the CNS

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Motor Neurons

carry impulses from the CNS to a muscle or gland

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Proprioceptors

  • Sensory receptors in the muscles and tendons

  • Detect stretch or tension in skeletal muscles, tendons and joints

  • Maintain balance and posture

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Four Types of Neuron Structure

Unipolar, Bipolar, Multipolar(most common), Pseudounipolar

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Two major functional properties of neurons

Irritability & Conductivity

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Irritability

Ability to respond to a stimulus and convert it into a nerve impulse

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Conductivity

Ability to transmit the impulse to other neurons, muscles, or glands

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Things that excite a neuron

Lights, sound waves, pressure, chemicals, neurotransmitters

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Events in a Nerve Impulse

  1. Neuron at rest is polarized

  2. Stimulus changes membrane permeability

  3. Depolarization & generation of action potential

  4. Action potential propagates along entire length of neuron

  5. Repolarization-membrane returns to resting state

  6. Sodium-potassium pump restores ion balance

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Neurotransmitters

  • Chemicals released at the end of an axon terminal that diffuse across the synapse and transfer the nerve impulse to another nerve, muscle, or gland

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How do neurons communicate?

Via electrical and chemical synapses

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4 Major Brain Regions

Cerebrum, Diencephalon, Brain Stem, Cerebellum

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Cerebrum

  • The largest and most superior part of the brain

  • Composed of 2 cerebral hemispheres divided by longitudinal fissure

  • Surface shows elevated ridges of tissues called gyri and shallow grooves called sulci

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Cerebral Cortex

  • Outermost layer of the cerebrum

  • Composed of gray matter

  • Responsible for thinking and processing information from the five senses

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Cerebral Lobes

  • Grooves or fissures divide into sections or lobes

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Frontal Lobe

  • Motor function, problem solving, memory, language, judgment, socially acceptable behavior

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Parietal Lobe

  • Processes sensory information such as touch, temperature, and taste

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Temporal Lobe

  • Auditory perception, Olfactory area is deep inside

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Occipital Lobe

Visual processing center

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Diencephalon

  • Superior to the brainstem

  • 3 major structures: Thalamus, Hypothalamus, Epithalamus

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Thalamus

  • Relay station for sensory impulses traveling to the sensory cortex

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Epithalamus

  • Contains the pineal gland and choroid plexus which forms the cerebrospinal fluid

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Hypothalamus

Keeps your body in homeostasis

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Brain Stem

Made up of the midbrain, pons, and medulla oblongata

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Midbrain

  • Reflex center for vision and hearing, eye movements

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Pons

Coordinates information between brain areas, involved in breathing

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Medulla Oblongata

  • Blood pressure, breathing, heart rate

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Cerebellum

  • Precise timing of skeletal muscle activity

  • Balance and equilibrium

  • Makes body movement smooth and coordinated

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Bones

Skull and vertebrae

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Meninges

Connective tissue matter

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Dura Mater

Tough outer double layer membrane

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Arachnoid Mater

Web-like layer spans the subarachnoid space

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Pia Mater

Innermost membrane that clings tightly to the surface of the brain and spinal cord

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Cerebrospinal Fluid (CSF)

  • Continually formed plasma by clusters of capillaries in cavities called ventricles

  • Provides a watery cushion for the brain & spinal cord

  • Significant changes in CSF composition may indicate problems

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How is CSF obtained for testing?

Itā€™s obtained through a procedure called a spinal or lumbar tap

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Blood Brain Barrier

  • The brain depends on a very stable internal environment

  • Neurons are protected from blood-borne substances by the least permeable capillaries in the body

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Spinal Cord

  • Continuous with the brain stem; connects the brain to nerves

  • Enclosed within vertebrae; provides a 2-way path to and from the brain

  • Major reflex center

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Peripheral Nervous System (PNS)

Endoneurium, Perineurium, Epineurium

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Endoneurium

Surrounds each neutron

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Perineurium

Surrounds a group of neurons or fascicle

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Epineurium

Surrounds a nerve

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How many pairs of spinal nerves are there?

  • 31 pairs of spinal nerves exit from the vertebral column

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Plexus

  • All other spinal nerves form complex networks each called a plexus, which serve the motor and sensory needs of limbs

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Cranial Nerves

Nerves that originate in the brain

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How many pairs of cranial nerves are there?

12 pairs that serve the head and neck

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Autonomic Nervous System

  • Motor subdivision of the PNS that automatically controls bodily activities

  • Maintains homeostasis

  • Includes neurons that control cardiac muscle, smooth muscle, glands

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Fight or Flight

  • The sympathetic nervous system prepares the body to either fight or run from a threat

  • Enables the body to cope rapidly and vigorously with situations that may disrupt homeostasis

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Parkinsonā€™s Disease

  • A motor system disorder that leads to trembling of the hands, arms, legs, jaws, or face and impaired balance and coordination

  • Results from a loss of brain cells in area of the midbrain called the substantia nigra

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80

Multiple Sclerosis

Occurs when the Myelin Sheath around neurons is gradually destroyed and hardens into ā€œsclerosesā€

Nerve impulse are interrupted

Autoimmune disease with no cure

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81

Alzheimerā€™s

A type of mental illness caused by progressive brain cell death

Leads to problems with memory, thinking, and behavior

Symptoms worsen over time and there was no cure

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Concussion

A mild traumatic brain injury

Caused by a jolt, bump, or blow to the head that causes the brain to move rapidly inside the skull

Symptoms: Dizziness, confusion, headache & nausea

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83

Meningitis

Acute inflammation of the meninges

Usually caused by vital or bacterial infection

Can lead to deafness, epilepsy, brain damage, or death

Symptoms: sever headaches & neck stiffness

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Epilepsy

Brain disorder that causes seizures

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Stroke

Occurs when something blocks oxygen supply to the brain and a blood vessel bursts

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