Nervous System

Question 1

what part of your eye uses small muscles to change its shape so that you can focus on near or distant objects?

Answer 1

lens

Question 2

the two divisions of the peripheral nervous system

Answer 2

somatic and autonomic

Question 3

which of the following is the function of the cerebrum

Answer 3

control conscious activities in the body

Question 4

what are sense organs a part of?

Answer 4

PNS

Question 5

a cell that carries messages through the nervous system is

Answer 5

neuron

Question 6

function of neurotransmitters

Answer 6

transmit nerve impulses across synapses

Question 7

what begins when a neuron is stimulated by another neuron or its environment

Answer 7

an impulse

Question 8

when an action potential reaches the end of a neuron, it triggers the release of…

Answer 8

neurotransmitters

Question 9

what is the smallest structional and functional unit of the nervous system

Answer 9

neuron

Question 10

reflex

Answer 10

a quick automatic response to a stimulus

Question 11

chemicals used by a neuron to transmit messages across a synapse

Answer 11

neurotransmitters

Question 12

hypothalamus

Answer 12

the control centre for the recognition of hunger, thirst, fatigue, and body temperature

Question 13

reflex arc

Answer 13

simple nerve pathways

is responsible for our reflexes

Question 14

coordinated response

Answer 14

produced when a sensory neuron connects to a range of neurons within the CNS

Question 15

reflex arc process

Answer 15

1. Receptors detect a stimulus and generate a nerve impulse
2. Sensory neurons conduct a nerve impulse to the CNS along a sensory pathway
3. Sensory neurons enter the spinal cord through the dorsal route
4. Sensory Neurons forms a synapse with an interneuron
5. Inter neuron forms a synapse with a motor neuron that leaves the spinal cord through the ventral route
6. The motor neuron carries impulses to an effector which produces a response

Question 16

Dendrites

Answer 16

receive impulses and send these to cell body

Question 17

Axon

Answer 17

carries information away from cell to terminal buds

Question 18

Myelin sheaths

Answer 18

fatty covering over axon, insulation to help impulse travel faster

Question 19

Schwann cells

Answer 19

form myelin sheath

Question 20

Nodes of Ranvier

Answer 20

regularly occuring gaps in myelin sheath

Question 21

Synapse

Answer 21

space between terminal axon and dendrites of next neuron

Question 22

Terminal Buds

Answer 22

located at the end of axon to secrete neurotransmitters

Question 23

what are the two divisions of the Nervous system

Answer 23

Central Nervous System and the Peripheral Nervous system

Question 24

purpose of the PNS

Answer 24

carries info between the body and the CNA

Question 25

purposes of the nervous system

Answer 25

- receive information from the environment - integrates information - transmits chemical signals - conducts electrical signals (impulses) - coordinates metabolic processes

Question 26

two types of cells in the nervous system

Answer 26

gilal cells | neurons

Question 27

glial cells

Answer 27

1. non-conducting 2. support structures 3. provides nourishment

Question 28

neurons

Answer 28

1. functional nerve cells 2. **Three Types:** 1. Sensory neurons 2. interneurons/relay neurons 3. motor neurons