Chapter 5 & 8 - Reflexes

Question 1

Define reflex

Answer 1

automatic unconscious predictable response to stimuli without brain involvement

Question 2

what is the differnce between spinal and cranial reflexes?

Answer 2

cranial reflexes involve the brain while spinal don’t

Question 3

whats the differance between and innate and a conditioned reflex?

Answer 3

innate is a reflex you are born with while conditioned is a learned reflex

Question 4

whats the differance between a somatic and a autonomic reflex?

Answer 4

a somatic reflex involves motor neurons while an autonomic involves smooth/cardiac neurons

Question 5

The neural pathway involved in the accomplishing a reflex

a. intrafusal reflex
b. extrafusal reflex
c. reflex arc
d. stretch reflex

Answer 5

c.

Question 6

draw/describe the steps of the reflex arc

Answer 6

week 6 slide 31
A sensory receptor transmits sensory info down the afferent pathway. Travels through spinal verve and enters spinal column through dorsal root. In the spinal column the signal undergoes integration. It travels on the efferent pathway out the ventral root and through the spinal nerve towards an effector. The signal triggers a response in the effector.

Question 7

lable which characteristic is polysynaptic and which is monosynaptic

1. 1 spinal synapse
2. withdrawl reflex
3. crossed extensor reflex
4. Involves only afferent nerves
5. multiple spinal synapses involved
6. stretch reflex
7. Involves interneurons
8. Involves efferent neurons and afferent neuron

Answer 7

1. M
2. P
3. P
4. M
5. P
6. M
7. P
8. P

Question 8

which reflex prevents over stretch of the muscle

a. withdrawl reflex
b. crossed extensor reflex
c. stretch reflex
d. gamma reflex

Answer 8

C

Question 9

which fibers are responsible for contraction?

a. intrafusal
b. extrafusal
c. gamma
d. alpha

Answer 9

b

Question 10

Intrafusal muscle fibers ….

a. detect change in tesion
b. contain muscle spindles
c. are located within extrafusal fibers
d. all the above

Answer 10

d

Question 11

what are gamma motor neurons

Answer 11

efferent intrafusal fibers that cause muscle fiber to but not generate force

Question 11

what is the job of primary/seconday endings on afferent intrafusal fibers?

Answer 11

primary: detect length and speed change
secondary: only detect length change

Question 12

Describe alpha-gamma coactivation

Answer 12

Still confused week 6 slide 34

Question 13

Describe the stretch reflex

Answer 13

HELP

Question 14

How can gamma motor neurons assist alpha motor neurons?