If an individual is exercising at a low intensity for several hours, how would the concentrations of substrates change in plasma?
A. They remain stable and unaffected by exercise.
B. Plasma glucose levels would gradually increase the longer exercise continues.
C. Plasma levels of amino acids would increase, as protein breakdown would be needed to fuel continued exercise.
D. Plasma levels of free fatty acids would increase as triglycerides are broken down for sustained energy.
Answer: D
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Why can one say that chemical digestion begins in the mouth?
A. The teeth grind food to expose surface area for enzymatic action. B. The saliva contains lysozyme. C. The saliva contains mucus. D. The saliva contains electrolytes. E. The saliva contains amylase and lipase.
The opening in the larynx is called the ________________________________________
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Assume we could alter the conditions in the duodenum. Which of the following would be consistent with inserting a large volume of highly acidic chyme which contained a large amount of fat?(1) Decreased gastric acid secretion(2) Increased bile production(3) Increased pancreatic bicarbonate production and pancreatic enzyme secretion(4) Increased secretin and cholecystokinin
A. 1, 2, 3, 4 B. 1, 3, 4 C. 2, 3, 4 D. 1, 2, 3 E. 1, 2, 4
____________________ ions trigger the release of acetylcholine by exocytosis from a portion of the vesicles
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