Question

Reflex arcs, which involve no processing in the brain, are
beneficial because they permit
(a) instantaneous signaling to motor neurons
(b) avoidance of dangerous stimuli, even without a previously
"learned" response
(c) immediate response to dangerous stimuli
(d) all of these.​

Answer 1

Answer:

The answer to this question is (D) All of these.

Extra Information:

The reflex action takes place in the reflex arc. Reflex action is involuntary and immediate response to a sudden and dangerous stimuli.

Touching a sharp substance, hot substance, etc. are examples reflex action.

The reflex arc is present in the peripheral neural system and consists of a sensory neuron, receptor, motor neuron and the effector.

The process :

• The firstly receptor firstly detects the stimuli, received by a sensory organ.
• The signal of the stimuli is sent to the sensory neuron.
• The sensory neuron passes the information of the stimuli to the peripheral neural system which includes the spinal cord.
• The spinal cord receives the signal and passes the signal of the response to the motor neuron.
• The motor neuron effects the effector, resulting in the immediate response.