Multicellular Organisms Must Keep Their Cells Awash in an "Internal

question 53

Multiple Choice

Multicellular organisms must keep their cells awash in an "internal pond" because

• A) their membranes will crystallize if not in contact with interstitial fluid.
• B) an aqueous medium is needed for the cellular exchange of nutrients, gases, and wastes.
• C) this prevents the loss of water due to osmosis.
• D) their cells need to be protected from dissolved nitrogen gas in the blood.
• E) terrestrial organisms have not adapted to life in dry environments.

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Definitions:

Ciliary Body

A ring of tissue behind the iris of the eye, containing muscle that controls the shape of the lens for focusing and produces aqueous humor.

Hyperopia

A vision condition where distant objects are seen more clearly than near objects, often referred to as farsightedness.

Farsightedness

A common vision condition where distant objects are seen more clearly than close ones, also known as hyperopia.

Tonometer

An instrument used to measure the pressure inside the eye, important for diagnosing and monitoring glaucoma.