What Is the Purpose of Motor Nerve Varicosities as They

question 18

Multiple Choice

What is the purpose of motor nerve varicosities as they relate to smooth muscle?

• A)They link the thin filaments to the inside of the sarcolemma in smooth muscle.
• B)They reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down.
• C)They enable each cardiac myocyte to directly stimulate its neighbors.
• D)They release neurotransmitter onto smooth muscle cells.
• E)They prevent single-unit smooth muscle cells from pulling apart.

---

Definitions:

Stroke Volume

The amount of blood pumped by the left ventricle of the heart in one contraction, a key component in determining cardiac output and vascular health.

Baroreceptor Reflex

A reflex mechanism that helps maintain blood pressure stability by adjusting heart rate and blood vessel diameter in response to changes in blood pressure.

Blood Pressure

The force exerted by circulating blood on the walls of blood vessels, a critical indicator of cardiovascular health.

Preload

The degree of stretch of cardiac muscle fibers at the end of diastole, affecting the force of contraction.