A Procedure in Which Cells Are Collected from the Membranes

question 370

Multiple Choice

A procedure in which cells are collected from the membranes surrounding the fetus, then are tested for genetic abnormalities, is called ________.

• A) intra-uterine probe testing
• B) chorionic villus sampling
• C) ultrasound
• D) amniocentesis

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Definitions:

Action Potential

A rapid change in electrical charge across a neuron's cell membrane, allowing for the transmission of nerve impulses.

Excitatory Signals

These are biochemical impulses that promote or increase neural activity or the firing of neurons.

All-or-none Response

A biological principle indicating that a nerve or muscle fiber reacts completely or not at all to a stimulus.

Sodium/Potassium Pump

A vital cell membrane protein that pumps sodium out of cells and potassium into cells, maintaining the necessary concentration gradients for nerve impulse transmission and muscle contractions.