Unit 5: Notes 1 Flashcards Preview

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1

what are the three basic functions of the nervous system

sensory, integrative, motor

2

describe sensory

-sensory receptors detect/collect stimuli in/out of body
-sensory or a ferret neurons carry info to brain via spine and cranial nerves

3

describe integrative

processes information

4

describe motor

-response to sensory stimuli
-Motor or efferent neurons carry info from brain effectors (muscles or glands) via cranial or spinal nerves

5

what are the two main parts of the nervous system

Central nervous system and peripheral nervous system

6

describe the central nervous system

-Brain and spinal cord
-processes info and creates a response that is delivered through the PNS
-source of thoughts, emotion and memories

7

describe The three divisions of PNS

1. somatic: voluntary
2. autonomic: involuntary
3. enteric: involuntary "Brain of gut"

8

describe the peripheral nervous system

-nerves fibers and support cells
-collect info about internal/external environment

9

what does the somatic nervous system consists of

-sensory neurons convey info from sensory receptors to the CNS
-Motor neurons conduct impulses from CNS to skeletal muscles only

10

what does the autonomic nervous system consists of

-sensory neurons convey info from autonomic receptors in visceral organs to CNS
-Motor neurons conduct impulses from the CNS to smooth muscle, cardiac muscle and glands
-sympathetic, fight or flight
-parasympathetic, rest and digest

11

what does the enteric nervous system consists of

-sensory neurons monitoring chemical changes in gastric intestinal tract
-Motor neurons that govern contractions of G.I. smooth muscles and secretions of organs

12

how do the PNS and CNS communicate

electrical signals that are transmitted by neurons

13

what's are the three types of neurons

sensory, motor, Interneurons

14

describe sensory neuron

Carry impulses to CNS from sensory organs (afferent pathway)

15

describe motor neuron

impulses from the CNS to muscles and glands (effectors)(efferent pathway)

16

describe interneurons

send info between sensory neurons and motor neurons

17

what are the two types of nervous tissue

1. neurons - nerve cell
2. neuroglia - nerve support cell

18

what are the three main parts to a neuron

1. cell body: contains a nucleus and organelles
2. dendrite: receiving end
3. axon: conducts impulses towards another neuron

19

what are the additional parts to the neuron

axon hillock, axon collateral, axon terminal, and synapse

20

describe the axon hillock

small hill where axon join cell body and where action potential starts

21

describe axon collateral

Side branches of axon

22

axon terminal

distal end of, forms junction with other cells/glands

23

synapse

where to neurons communicate via neurotransmitters

24

what's my prevent electrical conductivity from passing to the next neuron

drugs

25

what is Myelin?

-layer of lipid and protein around axon
-insulate axon and speeds up action potential
-made by
1. Schwan cells in the PNS
2.oligodendrocytes in the CNS

26

nodes of Ranvier

-gaps in the myelin sheath that allow the impulse to jump
-The amount of myelin increases from birth to maturity

27

what diseases destroy myelin

multiple sclerosis and Lou Gehrig Disease

28

neuroglia

support, nourish and protect neurons

29

astrocytes

type of neuroglia in the CNS, most abundant, helps form blood brain barrier

30

what does the blood brain barrier do

restricts passage of most substances into the brain