Branches off the aortic arch include the
A) brachiocephalic trunk.
B) left subclavian artery.
C) left common carotid artery.
D) left subclavian artery and left common carotid artery.
E) brachiocephalic trunk, left subclavian artery, and left common carotid artery.
E
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What is the inner, gelatinous region of each intervertebral disc called?
A. Annulus fibrosus B. Nucleus pulposus C. Lamella D. Chondral ring E. Articular ring
Why do veins have relatively thin walls?
A) It allows a typical vein to change the diameter of its lumen. B) It allows a typical vein to be stretched as its diameter increases during ventricular systole. C) A typical vein's wall allows exchange to occur quickly by diffusion across endothelial cells or through gaps between adjacent endothelial cells. D) A typical vein does not need to withstand much pressure. E) There are sphincters associated with the walls of veins, which allow vasomotion to occur.
Which of the following vitamins can promote intestinal absorption of calcium and
phosphorus? A) K B) D C) A D) Niacin
Due to an enzyme defect, individuals with phenylketonuria cannot convert the amino acid phenylalanine to
A) urea. B) tyrosine. C) ketones. D) serotonin. E) ATP.