When Opposing the Thumb,which Muscle Is Active

question 44

Multiple Choice

When opposing the thumb,which muscle is active?

• A)flexor pollicis longus.
• B)abductor pollicis longus.
• C)flexor digitorum profundus.
• D)flexor carpi radialis.
• E)pronator teres.

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Definitions:

Plasma Membrane

The biological membrane that separates the interior of all cells from the outside environment, protecting the cell and controlling movement of substances in and out.

Hydrophobic Region

A part of a molecule that is repelled by water and tends to be nonpolar.

Phospholipids

A class of lipids that are a major component of all cell membranes, essential for cellular function.

Polar (Hydrophilic) Region

A part of a molecule that has a tendency to interact with water through hydrogen bonding or electrostatic interaction, making it soluble in water.