Peristalsis is a process in which
A. the entire esophagus contracts at once.
B. food is mechanically digested as it is repeatedly squeezed in a closed organ.
C. food is squeezed forward through the digestive tract.
D. food can move forward or backward.
E. contraction can only occur when food is present.
Answer: C
You might also like to view...
In brown adipose tissue, thermogenin inserts into the inner mitochondrial membrane and serves to
A) Uncouple oxidation from phosphorylation. B) Enhance the proton motive force. C) Eliminate two of the steps of electron transport. D) More than one of the above
Which one of the following is NOT true of cholesterol?
A) Cholesterol provides energy fuel for muscle contraction. B) Cholesterol serves as the structural basis of steroid hormones. C) Cholesterol serves as the structural basis of vitamin D. D) Cholesterol is a major building block of plasma membranes. E) Only about 15 percent of cholesterol comes from the diet.
Which number indicates the arrector pili muscle?
A. 1 B. 2 C. 3 D. 4 E. 5
Smooth muscle fibers can sustain a contraction without fatigue by allowing dephosphorylated myosin to remain attached to actin in what is called the ________.
What will be an ideal response?