Name the substance that protects the DNA of rapidly dividing skin cells from the damage caused by ultraviolet rays from the sun
A) carotene B) melanin C) hemoglobin D) keratin
Answer: B
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Which of the following signs of hypovolemic shock is a relatively late sign?
A) increased heart rate B) cold, clammy skin C) rapidly falling blood pressure D) rapid, thready pulse
Which of the following are considered differences between endocrine and neural control systems?
A) speed B) specificity C) nature of the signal D) duration of action E) All of the answers are correct.
Which of the following is an accurate characteristic of slow fibers?
A) Slow muscle tissue has a much less extensive network of capillaries than does typical fast muscle tissue. B) Resting slow muscle fibers contain oxygen reserves, bound to myoglobin. C) Slow muscle tissue has a lower oxygen supply than does fast muscle tissue. D) Slow muscle fibers contain fewer mitochondria than do fast muscle fibers. E) Slow muscle fibers contain myoglobin, a globular protein, which binds sodium.
Many upper motor neurons synapse with lower motor neurons in the ________.
A. posterior funiculus B. posterior horn C. posterior root ganglion D. anterior horn E. anterior funiculus