The lens of the eye flattens when
A. ciliary muscles contract.
B. ciliary muscles relax.
C. extrinsic eye muscles contract.
D. extrinsic eye muscles relax.
E. intrinsic muscles of the iris contract.
B
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Which of the following helps return blood to the heart?
A. Valves in the arteries B. Positive intrathoracic pressure C. Capillary action D. Contracting skeletal muscles
Gray matter of the spinal cord is mostly composed of
A) axons. B) cerebrospinal fluid. C) interneurons. D) myelin.
A traumatic injury to the umbilical region could affect which segments of the small intestine?
A) only the duodenum would be affected B) only the jejunum would be affected C) only the ileum would be affected D) the duodenum and jejunum would be affected E) all three segments of the small intestine would be affected
Cofactors such as NADH are found in all cells of the body and are often recycled. Such cofactors are categorized as __________ vitamins
A. essential B. nonessential