Immune System Changes That Render Older Adults More Susceptible to Contracting

question 9

Multiple Choice

Immune system changes that render older adults more susceptible to contracting HIV include all of the following except:

• A) Hyper-responsive T cells
• B) Age-related thymic involution
• C) Depletion of naïve CD4 cells
• D) Decline in B cell function

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Definitions:

Neurotransmitters

Chemical substances released by neurons to transmit signals across a synapse to another neuron, muscle cell, or gland cell.

Postsynaptic Structures

Components of a neuron located after the synapse that receive and process signals from presynaptic neurons.

Vesicles

Small sacs within the synaptic knobs that contain chemicals called neurotransmitters.

Impulse Transmission

The process by which nerve cells communicate with each other or with muscles, involving the movement of electrical or chemical signals across synapses.