In the Inherited Disease Ichthyosis, the Skin Is Rough, Brown

question 46

Multiple Choice

In the inherited disease ichthyosis, the skin is rough, brown, and very scaly because the uppermost layer cannot peel off as easily as skin normally does. The part of the skin that is affected is the

• A)epidermis.
• B)basement membrane.
• C)dermis.
• D)subcutaneous layer.

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Definitions:

Depolarization

The process during which a cell's membrane potential becomes less negative, making it more likely to fire an action potential.

Absolute Refractory Period

A period immediately following an action potential during which a neuron is incapable of generating another action potential, no matter the stimulus strength.

Stimulation

The act of applying a stimulus to generate a response in an organ or tissue.

Plasma Membrane

A semi-permeable membrane found in cells that separates the interior of the cell from its external environment and regulates the movement of substances in and out of the cell.