Reflexes

Question 1

reflex is

Answer 1

a rapid predictable motor response to an injury

Question 2

function of reflexes

Answer 2

help maintain homeostasis and protect from bodily injuries

Question 3

somatic reflexes involve

Answer 3

skeletal muscles (ex: knee jerk, corneal)

Question 4

visceral refelxes includes

Answer 4

smoot and cardia muscles, glands
-also known as autonomic reflex
-ex: corneal, pupillary

Question 5

when a reflex only involves the spinal cord and peripheral nerve it is called

Answer 5

a spinal reflex
-ex: patellar or stretch

Question 6

reflex arc

Answer 6

sensory receptor: generates graded potentials
sensory neuron: neurons transmit electrical impulses
integration center: interneurons in the spinal cord gray matter serve to integrate the incoming information before passing it on to the brain via the spinal cord
motor nueron: neurons which carry efferent impulses to the targets
effector: for example, skeletal, cardiac, or smooth. muscles or glands

Question 7

example of polysynaptic reflex

Answer 7

flexor refelx

Question 8

conduction time depends

Answer 8

on the number of synapes involved

Question 9

latent period is

Answer 9

the time consumed in impulse transmission over a reflex arc

Question 10

nuclear delay is the

Answer 10

portion of the latency consumed in the conduction through the cord

Question 11

patellar or stretch reflex info

Answer 11

-monosynaptic
-tibial tuberosity, paterllar tendon
-proprioceptors - muscle spindles are involved
-sensory input to spinal cord
-motor output to quadriceps via L2 to L4
-extension of lower leg

-

Question 12

intrafusal fibers contract in response to activation of

Answer 12

gamam motor fibers

Question 13

extrafusal fibers contract in response to activation of

Answer 13

alpha motor fibers

Question 14

extension of muscle increases

Answer 14

the rate of nerve impulses

Question 15

activation of alpha motor neurons causes

Answer 15

muscle to contract