Aldosterone promotes the homeostasis of ions by causing the kidneys to
A. excrete sodium and conserve potassium.
B. conserve sodium and potassium.
C. excrete sodium and potassium.
D. conserve sodium and excrete potassium.
Answer: D
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Angiogenesis refers to
A) Damage to blood vessels. B) Synthesis of blood vessels. C) Genetic analysis of blood vessels. D) The ontogeny of the vascular system.
Each skeletal muscle fiber is controlled by a neuron at a single
A) Synaptic knob. B) Sarcomere. C) Neuromuscular junction. D) Synaptic cleft. E) Transverse tubule
The portion of the hair below the surface of the skin is the
A. medulla. B. shaft. C. cuticle. D. root. E. hair bulb.
When physical exertion has ended and the body is at rest, veins demonstrate
A. vasoconstriction so that blood is shifted toward the rest of the circulatory system. B. vasodilation so that blood is shifted toward the rest of the circulatory system. C. vasodilation so that they function as blood reservoirs. D. vasoconstriction so that they function as blood reservoirs.