Which is not an involuntary part of the swallowing reflex?
A. The epiglottis closes off the top of the trachea.
B. The tongue rolls chewed food into a bolus and pushes it to the oropharynx.
C. Muscles pull the pharynx upward toward the food.
D. The tongue presses against the uvula and soft palate.
Answer: B
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Transcytosis combines diffusion and active transport.
Answer the following statement true (T) or false (F)
Stomach acid is neutralized
a. in the duodenum b. by trypsin c. by solutions secreted from the antrum d. in the colon e. by secretin
The kidneys work to rectify metabolic acidosis and alkalosis but have no effect on respiratory acidosis and alkalosis
Indicate whether the statement is true or false.
Substances can enter a cell either with or against the concentration gradient by ________ transport, which is powered by ________.
A. passive; electrolytes B. active; ATP C. active; electrolytes D. passive; ATP