Question

in the demonstrate monosynaptic reflexes lab, why do the reflexes occur? select all that apply.check all that applyby triggering the tendon of a muscle you are initiating the reflex arc.by triggering the tendon of a muscle you are initiating the reflex arc.by triggering stretch receptors in the muscle you are initiating the reflex arc.by triggering stretch receptors in the muscle you are initiating the reflex arc.by triggering a skin receptor near the muscle you are initiating the reflex arc.by triggering a skin receptor near the muscle you are initiating the reflex arc.by triggering the muscle effector you are initiating the reflex arc.by triggering the muscle effector you are initiating the reflex arc.by triggering the efferent motor neuron you are initiating the reflex arc.by triggering the efferent motor neuron you are initiating the reflex arc.

Answer 1

The monosynaptic reflexes occur when the tendon of a muscle is triggered, leading to the activation of muscle spindles and initiating a reflex arc, resulting in muscle contraction for stability and to prevent overstretching.

Step-by-step explanation:

In the demonstrate monosynaptic reflexes lab, reflexes occur for several reasons. Primarily, by triggering the tendon of a muscle, stretch receptors within the muscle, known as muscle spindles, are activated. This initiation of the reflex arc causes a rapid stretch of the muscle, which then sends a signal via sensory neurons into the spinal cord. Within the spinal cord, this signal directly synapses onto a motor neuron in the ventral horn which then causes the muscle to contract. This contraction is a defensive mechanism of the body to prevent muscle overstretching and to maintain stability and posture.

The monosynaptic reflex arc bypasses the need for processing in the brain, allowing for a quick, involuntary response. Stretch reflexes such as the knee-jer`k reflex are examples of this type of reflex, where a tap to the patellar tendon stretches the quadriceps muscle and leads to its contraction. In summary, triggering the tendon leads to activation of stretch receptors, which in turn initiate the reflex arc, ultimately causing muscle contraction without involving the brain.