Astronauts in zero gravity are able to move food through their digestive tracts because ________
A) skeletal muscle puts pressure on the digestive tract
B) smooth muscle produces waves of contractions that propel material through the digestive tract
C) striated muscle creates a pressure gradient that forces material from one end of the digestive tract to the other
D) cardiac muscle maintains a high pressure that moves material through the digestive tract
E) skeletal muscle sphincters contract and allow materials to move through the digestive tract
B
You might also like to view...
The integrative centers for autonomic activity are located in the
A) cerebrum. B) thalamus. C) cerebellum. D) pituitary gland. E) hypothalamus.
The placenta is formed of the following structures EXCEPTÂ the ________.
A. chorionic villi B. chorion C. endometrium D. allantois
Lymphocytes do not mature in which of the following organs?
A. Lymph nodes B. Liver C. Spleen D. Thymus E. Tonsils
During the resting membrane potential, the inside of a neuron is net ____________________ by charge
Fill in the blank(s) with correct word