Quiz 5: Potentials & Sensory

Question 1

Graded potential

Answer 1

Leads to action potential when strong enough

Occurs in dendrites and soma when there is a change in voltage

Spreads in all directions and dies out as it spreads

Question 2

Action potential

Answer 2

Axon hillock to axon to terminal buttons

Sends impulses for long distances

Excitatory or inhibitory

All or nothing; keeps strength

Question 3

Generating action potential (steps 1-3)

Answer 3

1. Cell membrane polarized @ -70mv; resting membrane potential
2. Cell body receiving excitatory and inhibitory signals from other neurons
3. Signals depolarize membrane

Question 4

Generating action potential (6-8)

Answer 4

6. Action continues from channels opening and closing to spread depolarization effect
7. When depolarization reaches telodendra, presynaptic cell releases neurochemicala
8. Presynaptic cell unresponsive for 0.8 ms

Question 5

Myelination

Answer 5

Allows for rapid transmission of neuronal impulses

Question 6

Myelin sheath

Answer 6

Fatty tissue around axon

Question 7

Sensory-motor integration

Answer 7

Sensory afferent (input)

Motor efferent (output)

Question 8

Types of sensory receptors

Answer 8

Exterocepters

Propriocepters

Interocepters

Question 9

Exterocepters

Answer 9

Receive stimuli on surface of body

Vision, sound, smell, superficial skin sensation

Question 10

Propriocepters

Answer 10

Receive stimuli from from muscles, tendons, and joints (includes inner ear)

Question 11

Interocepters

Answer 11

Receive stimuli from internal surfaces and include sensations of pain, pressure, or distension

Question 12

Energy transformers

Answer 12

Mechanoreceptive

Chemoreceptive

Thermoreceptive

Nociceptive

Question 13

Mechanoreceptive

Answer 13

Touch, pressure, and movement

Question 14

Chemoreceptive

Answer 14

Gustatory and olfaction

Question 15

Thermoreceptive

Answer 15

Temperature

Question 16

Nociceptive

Answer 16

Pain receptors for noxious stimuli affecting cells and tissues

Question 17

Generating action potential (4 and 5)

Answer 17

4. Axon hillock stimulated; action when graded is strong

5. Action travels down axon with same speed and strength to terminals

Question 18

Generating action potential (9 and 10)

Answer 18

9. Protein pumps activate and repolarize presynaptic cell

10. Post synaptic cell receives neurotransmitter across synaptic cleft and responds