Secretes acid and enzymes. Mixes food with secretions to begin enzymatic digestion of proteins.
Answer: Stomach
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Contractions of the skeletal muscles of the pelvic floor result in
A) erection. B) emission. C) ejaculation. D) detumescence. E) impotence.
The composition of alveolar air differs from atmospheric air. Indicate all of the factors that account for this difference.
A. Presence of water vapor B. Gas exchange adds CO2 C. Difference in overall (total) pressure D. Nitrogen does not enter alveoli E. Gas exchange removes O2
The chemical reactions involving the three classes of energy-rich organic molecules are collectively known as ____________________ metabolism
Fill in the blank(s) with correct word
Negative feedback operates to prevent any change in the value of a controlled factor in the body
Indicate whether the statement is true or false