The Phasic Ia Stretch Reflex

question 10

Multiple Choice

The phasic Ia stretch reflex:

• A)Has a polysynaptic reflex arc.
• B)Acts to maintain a constant level of tension in the muscle.
• C)Is initiated by a receptor that lies in series with the extrafusal fibers.
• D)Has its sensitivity controlled by the gamma motor neuron system.

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Definitions:

Hormones

Chemical substances produced in the body that regulate and control the activity of certain cells or organs, essential for every bodily function.

Olecrannon Process

The bony prominence of the ulna at the elbow, which forms the point of the elbow and connects with the humerus to allow arm extension.

Ulna

A bone in the forearm that runs parallel to the radius, playing a key role in the movement of the elbow and wrist.

Cartilage

Connective tissue in which the cells lie within lacunae embedded in a flexible, proteinaceous matrix.