Changes in the Immune System That Accompany Aging Include All

question 22

Multiple Choice

Changes in the immune system that accompany aging include all of the following except

• A) T cells becoming less responsive to antigens.
• B) fewer cytotoxic T cells responding to infections.
• C) decreased numbers of T helper cells.
• D) more efficient secondary responses.
• E) B cells are less responsive.

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Definitions:

Variable Factor

An input in the production process that changes in quantity as the level of production changes.

Quasi-Fixed Costs

Costs that are not completely variable but do change with the level of output or activity over certain ranges or periods of time.

Production Function

A mathematical model that describes the relationship between input resources and the maximum output that can be produced with those resources.

Cost of Producing

The total expenses incurred in the manufacture of a product, including raw materials, labor, and overhead costs.