Wavelike movements that propel food through the digestive system are called:
a. peristalsis
b. contractions
c. muscle propulsion
d. cilia beating
e. microvilli and villi motion
a
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Imagine that a young girl suffers a horseback-riding injury, and one of her ribs punctures her diaphragm. How will this injury affect the girl's breathing? Select all correct choices
A. The injury will make it easier to increase negative air pressure in her chest cavity, making inhalation easier. B. The injury will make it more difficult to increase negative air pressure in her chest cavity, making inhalation more difficult. C. The injury will make it more difficult to decrease negative air pressure in her chest cavity, making inhalation more difficult. D. The injury will not affect her at all, as intercostal muscles are responsible for breathing
Scleroderma is a disorder that can be caused by
A) retained fetal cells with surfaces that are similar to the mother's cells. B) retained fetal cells with surfaces that are very different from those of the mother. C) retained fetal cells with surfaces that are similar to the father's cells. D) repeated exposure to the scleroderma virus.
The digestion of starches begins in which structure of the digestive tract?
a. esophagus b. large intestine c. mouth d. small intestine e. stomach
Viroids infect
A. bacteria. B. plants. C. fungi. D. plants and animals. E. all organisms.