To exert effects on its target cell, ________ would require a second messenger.
A. nitric oxide
B. acetylcholine
C. epinephrine and acetylcholine
D. epinephrine
Answer: C
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The area of the urinary bladder bounded by the openings of the two ureters and the urethra is called the
A) renal pelvis. B) JG apparatus. C) pyramid. D) trigone. E) vasa recta.
Essential nutrients are those that our cells require but cannot make, and thus they must be present in the diet. Only some amino acids and some fatty acids are essential. What does that suggest about extreme diets that eliminate fats or proteins? What does that suggest about our carbohydrate intake? Describe the typical American diet, in terms of relative amounts of ingested carbohydrates, fats,
proteins, and nucleic acids. Propose some explanations for why one of those is predominant. What will be an ideal response?
The two types of cells of the nervous system are
A) neurons and neuroglia. B) axons and dendrites. C) Schwann cells and microglia. D) motor neurons and sensory neurons.
The ability of white blood cells to leave the circulation and enter tissues is called ________.
A. margination B. diapedesis C. intrusion D. chemotaxis E. exocytosis