HOSA Dental Terminology Practice

What term refers to the expansion or contraction of blood vessel walls?

1. Vesicle

2. Mobility

3. Vasomotor

4. Palpation

The correct answer is: Vasomotor

The term that refers to the expansion or contraction of blood vessel walls is "vasomotor." This concept is critical in understanding how blood flow is regulated in the body. Vasomotor refers to the processes by which blood vessels can change in diameter, either widening (vasodilation) or narrowing (vasoconstriction). These changes in vessel diameter directly impact blood pressure and blood flow to different tissues. Vasomotor control is primarily influenced by the autonomic nervous system, particularly the sympathetic division, and can be affected by various factors such as temperature and chemical signals. This regulation helps maintain homeostasis and can respond to the body's needs, such as during exercise or in response to injury. In contrast, the other terms provided refer to different concepts. "Vesicle" generally describes a small structure within a cell, often involved in transport or storage of substances. "Mobility" usually pertains to the ability to move freely or easily, which is not specific to blood vessels. "Palpation" refers to the examination of the body through touch, particularly to assess the texture, size, and location of certain structures, and does not involve changes in blood vessel diameter.