The ________ valve prevents backflow of blood from the aorta into the ________ ventricle.

A. pulmonary; right
B. aortic; left 
C. pulmonary; left
D. aortic; right


Answer: B

Anatomy & Physiology

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Embryonic stem cells growing in a lab dish are bathed in a "cocktail" of chemicals that

cause them to specialize into branching networks of single-nucleated cells that pulsate in unison. This tissue is most likely A) skeletal muscle. B) cardiac muscle. C) epithelial tissue. D) smooth muscle.

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The bones that form the fingers are the

A) carpals. B) tarsals. C) metacarpals. D) metatarsals. E) phalanges.

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The heart is an example of this level or organization.

a. tissue b. organ c. organ system d. organism

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Proteins are composed of chains of ________________________________________

Fill in the blank(s) with correct word

Anatomy & Physiology