The Velocity of Blood Flow Is

question 60

Multiple Choice

The velocity of blood flow is .

• A)slowest in the capillaries because the total cross- sectional area is the greatest
• B)slower in the arteries than in capillaries because arteries possess a relatively large diameter
• C)slower in the veins than in the capillaries because veins have a large diameter
• D)in direct proportion to the total cross- sectional area of the blood vessels

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Definitions:

SA Node

The sinoatrial node, often regarded as the heart's natural pacemaker, initiates electrical impulses that determine the heart rate.

AV Node

The Atrioventricular Node, a critical component of the heart's electrical system, responsible for controlling the timing of heart muscle contractions.

Bundle of His

A group of specialized heart muscle cells that are designed for electrical signaling, responsible for carrying impulses from the AV node to the heart's ventricles.

Pulmonic Valve

The heart valve that separates the right ventricle from the pulmonary artery and regulates blood flow to the lungs.