How Many HVLs Are Needed to Reduce Beam Intensity from 600

question 16

Multiple Choice

How many HVLs are needed to reduce beam intensity from 600 mR to 300 mR?

• A) one
• B) two
• C) three
• D) four

---

Definitions:

Autorhythmicity

The ability of certain cells, especially cardiac muscle cells, to generate a rhythmical impulse spontaneously.

Mitral Valve Prolapse

A condition in which the mitral valve of the heart does not close properly, sometimes causing blood to leak backward into the left atrium.

Left Atrium

The left atrium is the top left section of the heart, responsible for receiving blood rich in oxygen from the lungs and transferring it to the left ventricle.

Pulmonary Arteries

The pulmonary arteries are the vessels that carry deoxygenated blood from the right ventricle of the heart to the lungs for oxygenation.