Which of the Following Indicates That the Immune System Has

question 88

Multiple Choice

Which of the following indicates that the immune system has achieved versatility?

• A) Millions of NK cells are produced to ensure efficient immune surveillance.
• B) Lymphocytes, which are sensitive to an antigen, undergo repeated cell divisions.
• C) Production of many normal B cells and T cells, which will attack "self" antigens, occurs.
• D) Lymphocyte cell divisions produce two cell types: one group, which will attack specific antigens, and another group, which will remain inactive until exposed to the same antigen later.
• E) Millions of different lymphocyte populations are produced, each with different antigen receptors.

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Definitions:

Atrial Systole

The contraction of the atria chambers of the heart, which pushes blood into the ventricles.

Ventricular Systole

The phase of the cardiac cycle in which the ventricles contract, pumping blood out of the heart to the lungs and the rest of the body.

Isovolumetric Contraction

A phase in the cardiac cycle where the heart's ventricles contract with no change in volume because all valves are closed.

Myocardial Infarction

Commonly known as a heart attack, it occurs when blood flow to a part of the heart is blocked for a long enough time that part of the heart muscle is damaged or dies.