The sensory receptor detects the stimulus and initiates the reflex arc by sending signals to the central nervous system.

The Golgi tendon organ senses changes in muscle tension and helps to prevent excessive force during muscle contractions.

Acetylcholine is the primary neurotransmitter that transmits signals at the neuromuscular junction, facilitating muscle contraction.

The primary purpose of the stretch reflex is to maintain posture and balance by automatically adjusting muscle tension in response to changes in muscle length.

The autonomic nervous system regulates involuntary responses to stimuli, such as heart rate and digestion, which can also involve reflex mechanisms.

Reflex actions are primarily mediated by the central nervous system, which includes the brain and spinal cord.

The crossed extensor reflex involves the contraction of muscles on the opposite side of the body in response to a stimulus, providing balance and support.