Each Lung Is Situated Within a Subcavity of the Thoracic

question 44

Multiple Choice

Each lung is situated within a subcavity of the thoracic cavity known as the:

• A) pericardial cavity.
• B) peritoneal cavity.
• C) abdominopelvic cavity.
• D) pleural cavity.

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Definitions:

Plasma Membrane

The semipermeable membrane surrounding the cytoplasm of a cell, responsible for controlling the movement of substances in and out of the cell.

Membrane Potential

The electrical potential difference across a cell's plasma membrane, critical for the conduction of impulses in neurons and muscle cells.

Depolarization

The process in which the electrical charge of a cell membrane becomes less negative, often leading to the initiation of an action potential.

Repolarization

The process of restoring the negative charge inside the membrane of a neuron or muscle cell after depolarization.