Chapter 12: Nervous Tissue (Part 1) Flashcards Preview

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Flashcards in Chapter 12: Nervous Tissue (Part 1) Deck (100)
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1

What systems maintain the internal coordination? (2)

endocrine & nervous system

2

Which system communicates using chemical messengers secreted into the blood?

endocrine

3

Which system employs electrical & chemical means to send messages?

nervous

4

3 basic tasks of the nervous system

1. Receive info about changes in the body & transmit info to spinal cord & brain
2.Brain & spinal cord process the info and determine response
3.Brain & spinal cord issue commands to muscles & glands to carry out response

5

What are the 2 subdivisions of the nervous system?

-central nervous system (CNS)
-peripheral nervous system (PNS)

6

What is included in the CNS?

spinal cord & brain

7

What is the PNS composed of?

ganglia & nerves

8

nerves

a bundle of nerve fibers wrapped in fibrous connective tissue

9

ganglion

a knotlike swelling in a nerve where neuron cell bodies are concentrated

10

What are the 2 subdivisions of the PNS?

sensory & motor

11

sensory afferent division

carries sensory signals from various receptors to the CNS

12

somatic sensory division

carries signals from receptors in the skin, muscles, bones, & joints

13

visceral sensory division

carries signals from the viscera of the thoracic and abdominal cavities

14

afferent

towards the CNS

15

efferent

away from the CNS

16

motor efferent division

carries signals from the CNS to gland and muscle cells that carry out body responses

17

effectors

cells and organs that respond to commands from CNS

18

somatic motor division

carries signals to skeletal muscles

19

visceral motor division is also known as_____

autonomic nervous system
involuntary that carries signals to glands, smooth muscle

20

visceral motor division is divided into

sympathetic & parasympathetic system

21

sympathetic division

"fight or flight" response
tends to arouse body for action

22

parasympathetic division

"rest or digest"
tends to have calming effect

23

excitability

respond to environmental changes called stimuli

24

properties of neurons (3)

-excitability
-conductivity
-secretion

25

conductivity

neurons respond to stimuli by producing electrical signals

26

secretion

when electrical signal reaches end of nerve fiber and a chemical is secreted

27

______->________->________

afferent; interneurons; efferent

28

interneurons (3)

-lie entirely within the CNS
-carry out the integration function of the CNS
-90% of neurons

29

integrative function

ability to process, store, and retrieve info to make decisions

30

soma (4)

-the control center of the neuron
-made of microtubules & neurofibrils
-no centrioles = no cell division
-inclusions