Reflexes

Question 1

reflex arcs

Answer 1

signalling pathways that bypass the brain and only involve the transfer of information via spinal nerves

Question 2

mono-synpatic reflex arcs

Answer 2

sensory neuron synpasing motor neuron using no interneuron

Question 3

poly-synaptic reflex arcs

Answer 3

use of interneurons

Question 4

knee jerk reflex

Answer 4

• mono-synpatic stretch reflex
• sensory receptor = stretch spindle
• motor neuron induces contraction of quadricep
• same sensory neuron joins motor neuron for the relaxation of the flexor

Question 5

withdrawl reflex

Answer 5

• polysynaptic reflex
• sensory neuron = pain receptor (usually)
• motor neuron induces muscle contraction to remove pain stimulus
• sensory neuron synpases another interneuron to signal relaxation in flexor (crossed extensor reflex)

Question 6

control reflex

Answer 6

closed loop reflexes where reflex acts on stimulus

Question 7

protective reflex

Answer 7

open loop reflex where reflex does not act on stimulus

Question 8

somatic efferent

Answer 8

single motor neuron

Question 9

autonomic efferent system

Answer 9

2 neuron chain (interneuron use)

Question 10

excitatory interneuron

Answer 10

contraction

Question 11

inhibitory interneuron

Answer 11

relaxation