nervous system

Question 1

CNS

Answer 1

brain, spinal cord

Question 2

PNS

Answer 2

nerves

Question 3

neuron

Answer 3

dendrites, cell body and axon. transport info in the form of electrical signals

Question 4

sensory neurons

Answer 4

get info from a sensory receptor in the body to the CNS - detect changes in environment

Question 5

motor neurons

Answer 5

transmits commands away from the CNS to the muscles and glands

Question 6

interneuron

Answer 6

located within CNS, connect motor and sensory neurons. combine incoming info with outgoing messages

Question 7

action potential

Answer 7

rapid change in polarity across the membrane of the neuron. requires 2 types of gated channel proteins : depolarisation and repolarisation

Question 8

depolarisation

Answer 8

sodium gates open Na flows into cell, membrane potential changes from -65mV to
+40mV

Question 9

repolarisation

Answer 9

potassium gates open K flows to outside axon. membrane potential changes from +40nV to -65mV

Question 10

neurotransmitters

Answer 10

chemical messenger which transmits signals across a chemical synapse from one neuron to another

Question 11

somatic nervous system (func division)(voluntary)

Answer 11

responsible for co-ordinating the bodys movements and for receiving external stimuli - regulates activities under conscious control

Question 12

autonomic nervous system (involuntary)

Answer 12

sympathetic, parasympathetic, enteric

Question 13

sympathetic ns

Answer 13

responds to impending danger

Question 14

parasympathetic ns

Answer 14

when a person is resting. main function to activate “rest and digest” response and return the body to homeostasis after fight or flight response

Question 15

enteric ns

Answer 15

manages many aspects of digestion