Which of the following statements is true regarding activity in the alveoli?
A) Type II pneumocytes are the site of gas exchange.
B) Alveolar capillaries constrict when oxygen levels are high.
C) Type I pneumocytes produce surfactant.
D) Alveolar macrophages collect stray dust particles.
E) They are composed of simple cuboidal epithelium.
Answer: D
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In the female, erectile tissue that corresponds to the corpus spongiosum in the male is the:
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What does the embryonic neural tube develop into?
A. The liver and spleen B. The brain, spinal cord, and vertebrae C. The digestive tract D. The brain and spinal cord E. The vertebrae