How do veins prevent the backflow of blood?

A) Gravity
B) Pressure
C) Valves
D) Bulk flow


Answer: C

Anatomy & Physiology

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The partial pressure of oxygen in the pulmonary veins

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From which amino acid are dopamine, norepinephrine, and epinephrine all derived?

A. Serine B. Histidine C. Tryptophan D. Tyrosine

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Which of these is one of the auditory ossicles?

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What is considered the nail's growth center?

A. Nail groove B. Nail fold C. Nail matrix D. Nail plate

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