The Ultraviolet Range Encompasses What Wavelengths

question 193

Multiple Choice

The ultraviolet range encompasses what wavelengths?

• A) 100 - 450nm.
• B) 530 - 580 nm.
• C) 1 - 50 nm.
• D) 10 - 80 nm.
• E) 420 - 500 nm.

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Definitions:

Membrane Receptor

A specialized protein molecule embedded in the cell membrane that can interact with specific molecules, starting a chain of cell responses.

Depolarization

The process in which a cell's membrane potential becomes less negative, moving towards zero, which is critical in the initiation of action potentials.

Threshold Stimulus

Stimulus resulting in a local potential just large enough to reach threshold and produce an action potential.

All-Or-None Contraction

A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.