Which of the following is a feature of peristalsis?
a. It remains quiet between meals when the GI tract is empty
b. It occurs along the GI tract at a constant rate when food is present
c. It involves parallel and circular muscles found in the walls of the intestines but not the stomach
d. It consists of wavelike muscular contractions resulting from alternate tightening and relaxing of circular muscles and longitudinal muscles
d
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Which characteristic or function of water allows it to act as a lubricant?
a. ability to dissolve substances b. incompressibility c. heat-holding capacity d. chemical reactivity e. ability to bond with other substances
A vitamin A deficiency can cause night blindness
Indicate whether the statement is true or false
Special cells in which of the following organs are responsible for the drive to eat?
A) pituitary gland B) stomach C) small intestine D) hypothalamus
Excessive amounts of homocysteine in the blood are thought to increase the risk for ____
a. cancer b. diabetes c. heart disease d. protein-energy malnutrition e. hypothyroidism