One type of experimental contraceptive device is a skin patch that contains a chemical absorbed through the skin. Which of the following substances might be the type of chemical involved?
A. proteins
B. carbohydrates
C. lipid-soluble substances
D. amino acids
E. water-soluble substances
C
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The number of distinct cell types in the human body is about twenty.
Answer the following statement true (T) or false (F)
Puffer fish poison blocks voltage-gated sodium channels like a cork. What effect would this neurotoxin have on the function of neurons?
A) Neurons would depolarize more rapidly. B) Action potentials would lack a repolarization phase. C) The absolute refractory period would be shorter than normal. D) The axon would be unable to generate action potentials. E) None, because the chemically gated sodium channels would still function.
Identify the five major parts of the intrinsic conduction system of the heart in their normal order, beginning with the pacemaker
What will be an ideal response?
The first paired branches of the abdominal aorta are the
A) renal arteries. B) inferior phrenic arteries. C) superior mesenteric arteries. D) common iliac arteries. E) gonadal arteries.