Which of the following is the single most important stimulus for epiphyseal plate activity during infancy and childhood?
calcium
thyroid hormone
growth hormone
parathyroid hormone
growth hormone
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This portion of the brain adjusts skeletal muscle activity to maintain equilibrium and posture.
A. Pons B. Cerebrum C. Medulla oblongata D. Epithalamus E. Cerebellum
Why is the skin capable of repair, even after serious damage?
A) All layers of the skin have an excellent blood supply. B) Stem cells persist in both the epidermis and dermis. C) Individual skin cells have a high metabolic rate. D) There are abundant fibroblasts in the epidermis. E) Construction of scar tissue is easier than making normal skin.
The plasma membrane
a. appears under an electron microscope as a double dark line with a light space between. b. is composed primarily of a double layer of phospholipid molecules with proteins interspersed throughout the phospholipids in a mosaic pattern. c. separates the intracellular and extracellular fluid. d. two of these answers. e. all of these answers.
The conversion of fibrinogen to fibrin is catalyzed by
A) fibrinogen-converting enzyme. B) plasmin. C) factor VIII. D) thrombin. E) prothrombin activator.