How Often Can a Person Donate a Unit of Whole

question 1

Multiple Choice

How often can a person donate a unit of whole blood for a directed donation?

• A) 8 weeks
• B) 2 weeks
• C) 48 hours
• D) 24 hours

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Definitions:

Terminal Button

The small bulb-like structures at the end of axons that contain neurotransmitters and facilitate the transmission of signals to other neurons.

Neurotransmitters

Chemicals that transmit signals across a synapse from one neuron to another in the brain and nervous system.

Autoreceptors

Specialized receptor molecules located on a neuron that respond to the neurotransmitter released by that neuron, regulating its own function.

Presynaptic Side

The part of a synapse that releases neurotransmitters from the axon terminal of a neuron into the synaptic cleft, initiating a neural signal.