Although the Brain Makes Up Only One Fortieth of the Total

question 42

Multiple Choice

Although the brain makes up only one fortieth of the total weight of the adult human body,it uses __________ of the circulating blood,available oxygen,and available glucose.

• A)one-thirtieth
• B)one-twentieth
• C)one-tenth
• D)one-fifth

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Definitions:

Sinoatrial (SA) Node

The heart's natural pacemaker, responsible for initiating the electrical impulses that determine heart rate.

Cardiac Output

The volume of blood the heart pumps per minute, which is crucial for maintaining blood flow to the body.

Ventricular Contractions

Heartbeats initiated by electrical impulses causing the ventricles to contract, pumping blood out of the heart.

Cardiac Contractile Strength

Cardiac Contractile Strength refers to the force generated by the heart muscle during contraction, crucial for pumping blood effectively throughout the body.