Reflex and action potential quiz

Question 1

Effector

Answer 1

Carries out instructions from the brain

Question 2

Sensory pathway

Answer 2

Carries impulse to CNS(dorsal)

Question 3

Receptor

Answer 3

Detects change in environment, cause action potential

Question 4

Interneuron

Answer 4

Located with CNS, reflexes are processed by these

Question 5

Motor pathway

Answer 5

Carries impulses from CNS(ventral)

Question 6

Reflex arc

Answer 6

Neutral circuit through the spinal cord that provides a framework for a reflex action

Question 7

1 step in reflex arc

Answer 7

Arrival of stimulus and activation of receptor

Question 8

2 step in reflex arc

Answer 8

Activation of a sensory neuron

Question 9

3 step in reflex arc

Answer 9

Information processing in CNS(spinal cord) interneuron

Question 10

4 step in reflex arc

Answer 10

Activation of a motor neuron

Question 11

5 step in reflex arc

Answer 11

Response by effector [by sept, hand off stove]

Question 12

Are reflexes involuntary or voluntary

Answer 12

Reflections do not involve the brain(they are involuntary and unconscious)

Question 13

Action potential

Answer 13

Nerve impulse-message or wave travelling down a nerve

Question 14

How long does an action potential occur for

Answer 14

An action potential lasts for approximately 2.5 ms

Question 15

What happens to the permeability of the neuron cell membrane when it becomes excited?

Answer 15

More permeable to sodium ions and less permeable to potassium ions

Question 16

Depolarization

Answer 16

Result of the diffusion of sodium ions into the nerve resulting in a charge reversal

Question 17

Repolarization

Answer 17

Restoring the original polarity of the nerve membrane,K+ & Cl- channels open, Na+ channel close

Question 18

Time taken for a neuron to become repolarized

Answer 18

It takes an hour on 1– 10 ms to become completely restored to its resting state

Question 19

Refractory period

Answer 19

Time taken for a neuron to become repolarize, hyper polarization

Question 20

Hyper polarization

Answer 20

Keeps neuron from continuously firing-> needs more intensity to reach threshold. keeps message moving forward [prevent it from moving backwards]

Question 21

Threshold

Answer 21

Minimum stimulus from neuron to fire-> “All or nothing” response

Question 22

Excited

Answer 22

Contricts

Question 23

Inhibited

Answer 23

Relaxed

Question 24

1 step in seeing

Answer 24

Eye

Question 25

2 step in seeing

Answer 25

Optic nerve

Question 26

3 step in seeing

Answer 26

Thalamus(grey matter)

Question 27

4 step in seeing

Answer 27

Motor neuron

Question 28

5 step in seeing

Answer 28

Iris (circular+radial muscle)