The rate of oxygen diffusion across the respiratory membrane depends upon all of the following except:
A. the thickness of the respiratory membrane.
B. partial pressure of oxygen in the alveoli.
C. partial pressure of oxygen in the blood.
D. partial pressure of carbon dioxide in the blood.
Answer: D. partial pressure of carbon dioxide in the blood.
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Which statement would be true at a membrane during its resting membrane potential?
a. It is more permeable to K+ than to Na+. b. It is highly permeable to Cl-. c. The electrical gradient for Cl- opposes its concentration gradient d. All of the above statements are true. e. Only b and c are true
Which of the following is a characteristic of the autonomic nervous system?
A) controls smooth and cardiac muscles B) uses acetylcholine exclusively C) voluntary control usually D) only one nerve fiber from the CNS to effector
Why does the administration of epinephrine ease the respiratory difficulties of a person with bronchitis?
What will be an ideal response?
Both ______ and _______ are produced from the same large precursor molecule, pro-opiomelanocortin
a. aldosterone; cortisol b. cortisol; androgen c. ACTH; MSH d. aldosterone; androgen e. aldosterone; MSH