A Foreign Antigen Has Entered the Body, Which Has Elicited

question 47

Multiple Choice

A foreign antigen has entered the body, which has elicited the immune response. A helper T cell binds to an antigen fragment on an antigen-presenting cell. What happens next? ​

• A)B cells produce more antibodies.
• B)​A  cytotoxic T cell destroys the antigen.
• C)​F ree antibodies attach to the antigens.
• D)​A  macrophage engulfs the target antigen.

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Definitions:

Relaxation Phase

The phase in the cardiac cycle or muscle contraction where the muscle returns to its initial state of relaxation.

Sarcoplasmic Reticulum

A network of tubules and sacs in muscle cells that store and regulate calcium ions, crucial for muscle contraction.

Depolarization

A reduction in the difference in voltage across a cell's plasma membrane, which is fundamental in the propagation of nerve impulses.

Calcium

An essential mineral in the body, critical for bone health, muscle function, and nerve signaling.