Simple Diffusion of Molecules Occurs

question 55

Multiple Choice

Simple diffusion of molecules occurs

• A) from an area of lesser concentration to an area of greater concentration.
• B) in nonliving systems as well as living systems.
• C) across plasma membranes only through transport proteins.
• D) until those molecules are more highly concentrated on one side of the plasma membrane.
• E) only in molecules that are in a gaseous state.

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Definitions:

Autonomic

Pertaining to the autonomic nervous system, which regulates involuntary bodily functions such as heart rate and digestion.

Blood Vessel

Tubular structures carrying blood through the tissues and organs; a vein, artery, or capillary.

Constrict

To constrict means to narrow or become tighter, often referring to the reduction in diameter of blood vessels or other tubular structures in the body.

Splanchnic Nerve

Nerves that innervate the viscera, transmitting information to and from the visceral organs to the central nervous system.