Reflex Arcs and Neurons

Question 1

What is the Skeletomotor Reflex arc

Answer 1

A stimulus applied to the receptor triggers action potential in sensory afferent fibers
- involve synaptic connection between sensory neurons, interneurons and motor neurons

Question 2

Type of reflex arcs

Answer 2

Monosynaptic : direct connection between a sensory neuron and a motor neuron
Disynaptic: Involves 1 interneuron
Trisynaptic : involves 2 interneurons
Polysnaptic : maybe than 3 interneurons

Question 3

somatosensory neuron

Answer 3

• these neurons transmit ssensory infotmation from bodily tissue and have a psuedo- unipolar structure.
• examples include nociceptive

Question 4

Sensory nuerons and reflexes

Answer 4

Sensory neuron cell bodies are located in the dorsal root ganglia of the spinal cord

• reflexes such as spinal reflexes bypass the brain involving the spinal cord

Question 5

Muscle spindle function

Answer 5

• detect changes in muscle length and speed

Question 6

what are the two types of sensory endings

Answer 6

Type Ia ( fast adapting) : respond to rapid stretch
Type II (slow adapting) measure the degree of stretch

Question 7

Monosynaptic stretch reflex

Answer 7

Responsible for reactions like the knee jerk reflex - triggered by a rapid but small stretch which evokes a strong response from Ia afferents
- reflex is not based on restoring muscle length but on responding to the speed of lengthening

Question 8

Type of reflex responses

Answer 8

simple reflexes
- eye blink
complex reflexes
- require coordinated and often sequential activation of multiple muscles.