How Does the Immune System Manage to Avoid Recognizing and Attacking

question 68

Multiple Choice

How does the immune system manage to avoid recognizing and attacking normal cells within the body?

• A)The body never makes T lymphocytes that can react against normal cells within the body.
• B)T lymphocytes that have the ability to recognize normal cells within the body are eliminated by apoptosis early in the development of the immune system.
• C)Normal body cells are coated with a special secreted protective proteoglycan that prevents the immune system from attacking them.
• D)Normal body cells are coated with a special secreted protective glycoprotein that prevents the immune system from attacking them.
• E)Normal body cells are coated with a mixture of special secreted protective proteoglycans and glycoproteins that prevents the immune system from attacking them.

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Definitions:

Depolarizing

A process in which a cell's membrane potential becomes less negative, moving towards zero, often leading to an action potential in neurons.

Repolarizing

The process by which a cell restores its membrane potential to a negative value after an action potential, preparing it for another action potential.

Hyperpolarizing

Hyperpolarizing refers to an increase in a cell's membrane potential, making it more negative and less likely to activate an action potential.

Threshold

The minimal level of stimulation required to trigger a neural impulse or a physiological response.