When fatty acids are metabolized for cellular respiration, the first step involves breaking two carbons off the chain at a time to form acetyl CoA molecules. Acetyl CoA then
A. undergoes glycolysis.
B. enters the citric acid cycle.
C. begins the electron transport chain.
D. is converted to pyruvate and lactate.
B
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Which statement is false regarding the oropharynx?
A. It houses the paired palatine tonsils. B. It is located posterior to the oral cavity. C. It houses the lingual tonsils. D. It houses the pharyngeal tonsil. E. It extends from the soft palate to the level of the hyoid bone.
If a muscle fiber were to suddenly and permanently stop producing ATP the fiber would no longer be able to actively transport calcium out of the cytoplasm (sarcoplasm) and the intracellular calcium concentration would rise
Which of the following would you expect to happen? A) The fiber would twitch uncontrollably due to excessive calcium bound to troponin. B) Myosin would be able to bind to the exposed binding sites on thin filaments but it would not be able to detach. C) Calcium would be transported to the sarcoplasmic reticulum therefore contractions would cease. D) No change would occur in a muscle that was relaxed to begin with.
What secretory cells of the stomach secrete hydrochloric acid?
A) chief cells B) parietal cells C) serous cells D) mucus neck cells
Blood glucose concentration rises after a meal and stimulates the pancreas to release the hormone insulin. Insulin travels in the blood and stimulates the uptake of glucose by body cells from the bloodstream, thus reducing blood glucose concentration. This is an example of ________.
A. set point adjustment B. positive feedback C. negative feedback D. dynamic equilibrium E. integration control