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Flashcards in NERVOUS Deck (23)
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1

The nervous system consist of

the spinal cord, the brain, and the nerves

2

Function of the nervous system

sensory input
integration
motor output

3

neurons

the functional unit of the nervous system
transmission of nerve impulse

4

Main parts of a neuron

cell body, axon, dendrites

5

Direction of the nerve impulses

dendrites transmit the impulse towards the cell body, while the axons transmit the impulse away from the cell body

6

Central nervous system

comprised of the brain and spinal cord
control center

7

Peripheral nervous system

spinal and cranial nerves
somatic and autonomic
Autonomic> sympathetic and parasympathetic

8

neurons transmit nerve impulses toward the CNS

Sensory (afferent)

9

neurons transmit nerve impulses away from the CNS toward the effector organs such as muscles, glands, and digestive organs

Motor (efferent)

10

The major parts of the brains are

cerebrum, cerebellum, and medulla oblongata

11

associated with movement and sensory input

cerebrum

12

responsible for muscular coordination

cerebellum

13

controls many vital functions such as respiration and heart rate

medulla oblongata

14

How long is the spinal cord

18 inches long from the base of skull to the first or second lumbar vertebrae

15

How many pairs of spinal nerves exit the spinal cord?

31

16

are those in which nerve impulses travel through the spinal cord only and do not reach the brain

simple (spinal) reflexes

17

most abundant, skeletal muscle

acetylcholine

18

"feel good"

dopamine

19

sleep, appetite, mood, and headache

serotonin

20

releases acid in the stomach

histamine

21

amino acid, inhibitory neurotransmitter of the spinal cord

glycine

22

Chemical synapse:

action potential
calcium is released
synaptic vesicles release neurotransmitters
neurotransmitters diffuse into the synaptic cleft, bind to specific receptors
bind to ion channels, grade potential
reuptake

23

junction that mediate info transfer from one neuron to another

synapse