A1 Nervous System

Question 1

nervous system

Answer 1

-takes in sensory info
-sends signals to right effectors

Question 2

CNS

Answer 2

brain + spinal

Question 3

PNS

Answer 3

• all nerves outside CNS
• senstory info to CNS
  -motor info from CNS

Question 4

Sensory neuron

Answer 4

sends impulses from receptors to CNS

Question 5

Motor neuron

Answer 5

Carry impulses from CNS to effectors (muscles/glands)

Question 6

interneauron

Answer 6

In CNS, connects sensory & motor neaurons

Question 7

myelin sheath

Answer 7

insulator made by schwann cells, protect + support neauron

Question 8

schwann cells

Answer 8

produce myelin

Question 9

nodes of ranvier

Answer 9

help impulses move faster

Question 10

nerve cell

Answer 10

impulses from receptors, interpret then send instructions to glands and muscles

Question 11

effectors

Answer 11

glands or muscles that respond to impulses

Question 12

resting potention

Answer 12

more K inside, more Na outside

Question 13

depolarization

Answer 13

Na channels open, inside becomes more positive bc Na moves in

Question 14

repolarization

Answer 14

Na channels close, K channels open, K leaves, inside becomes more negative

Question 15

refractory period - hyperpolarization

Answer 15

K gates close slowly as it tries to go back to resting potention