When the Diaphragm Contracts

question 68

Multiple Choice

When the diaphragm contracts

• A) the volume of the thoracic cavity increases.
• B) lung volume increases as the lungs are forced to expand.
• C) the intra-alveolar pressure increases.
• D) both (a) and (b) above.
• E) all of these answers.

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Definitions:

Nucleus

The central and most important part of an object, movement, or group, forming the basis for its activity and growth, or in cells, a membrane-bound organelle that contains the cell's chromosomes.

Cell Membrane

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

Substances

Materials or items with distinct physical or chemical properties.

Cytoplasm

The gel-like substance within a cell, excluding the nucleus, that contains organelles and is the site of numerous metabolic reactions.