Which Statement Concerning the Venous Valves Is Correct

question 47

Multiple Choice

Which statement concerning the venous valves is correct?

• A) They actively contract to force blood uphill against gravity.
• B) They passively close to prevent the backflow of blood in the veins.
• C) They are positioned at the entrances to the ventricles.
• D) They are two-way valves.

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Definitions:

Eye Pressure

The fluid pressure inside the eye, clinically referred to as intraocular pressure, important for diagnosing and managing glaucoma.

Macular Degeneration

A disease characterized by the deterioration of the macula, the central portion of the retina, leading to vision loss, particularly in the elderly.

Nearsightedness

A common vision condition where close objects appear clearly, but distant ones do not because of the shape of the eye.

Farsightedness

A common vision condition in which distant objects may be seen more clearly than objects that are near.