Explain why food does not normally go up into your nasal cavity or down into your lungs when you swallow-even if you are standing on your head when you swallow
What will be an ideal response
Presence of food in the oropharynx stimulates the deglutition center in the medulla and pons to move the soft palate and uvula upward to close off the nasopharynx, thus keeping food out of the nasal cavity. At the same time, the larynx rises and the epiglottis moves down and back to seal off the larynx, which is further closed by the vocal cords, thus keeping food from entering the lower respiratory tract.
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How would the kidneys respond to hypoventilation?
A. Decreasing secretion of H+ and increasing production of new HCO3- B. Increasing secretion of H+ and decreasing reabsorption of HCO3- C. Decreasing secretion of H+ and decreasing reabsorption of HCO3- D. Increasing excretion of CO2 E. Increasing secretion of H+ and increasing production of new HCO3-
A person in a persistent vegetative state
A) can move, but seems unaware of self. B) repeats the same phrases over and over. C) craves vegetables. D) cannot move, but is aware of self.
A connective tissue fiber refers to a(n) ________ and a muscle fiber refers to a/an ________.
A. entire cell; complex of macromolecules B. entire cell; part of a cell C. complex of macromolecules; entire cell D. entire cell; tissue E. complex of macromolecules; part of a cell
Natural Killer (NK) cells
A. are a type of plasma cell. B. are a type of macrophage. C. secrete enzymes that kill tumor or virus-infected cells. D. promote inflammation. E. are derived from B cells.