Why does breathing 100% oxygen have little effect on oxygen transport to tissues for a healthy person?
What will be an ideal response?
Answer: In a healthy person, hemoglobin is already near 100% saturating, so hemoglobin cannot bind any more oxygen. There will be an increase in the dissolved oxygen, but since this is a relatively small fraction of the oxygen transport, the effect on total oxygen delivery is relatively minor.
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Recessive genes are usually expressed in humans only when ________
A) the organism is in the embryonic stage B) they are coding for skin color C) they are coding for genetic diseases D) both alleles are exactly the same, or homozygous
The oxygen debt must be "paid" off following rigorous muscular activity because
a. creatine phosphate must be regenerated. b. lactic acid must be detoxified. c. glycogen stores must be rebuilt. d. ATP fuels muscle recovery. e. all these answers.
A person with Cushing syndrome has a tendency toward diabetes mellitus
a. true b. false
A physician is evaluating the cranial nerve function of a patient. To evaluate oculomotor nerve function, the physician should
A. ask the patient to follow the movement of an object with her gaze. B. touch the surface of the patient's eyeball to initiate blinking. C. stand behind the patient and whisper words to see if the patient can repeat them. D. ask the patient to open her mouth and stick out her tongue.