The circular muscles that control the movement of materials from one digestive system structure to the next are called ________.
Fill in the blank(s) with the appropriate word(s).
Ans: sphincters
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Which of the following statements about the ECM is most CORRECT?
A. It is composed of living cells. B. Its components are produced by specialized cells and transported throughout the body and deposited around the cell. C. It is a source of protein for cells. D. It protects cells from infectious agents. E. Its components are produced and secreted by the cell.
The deactivation and metabolism of serotonin
a. involves removal from the cleft by COMT. b. can be increased by SSRIs like Prozac. c. is selectively affected by the neurotoxin MDMA. d. yields the metabolite 5-HIAA. e. All of the above
Which of the following is the correct sequence of events during mitosis?
A) Nuclear membrane dissolves, chromosomes line up, chromosomes split, nuclear membrane forms B) Nuclear membrane forms, chromosomes line up, chromosomes split, nuclear membrane dissolves C) Chromosomes line up, nuclear membrane forms, nuclear membrane dissolves, chromosomes split D) Chromosomes split, nuclear membrane dissolves, nuclear membrane forms, chromosomes line up
Which of the following structures is NOT found in prokaryotic cells?
a. Flagellum b. Axial filament c. Cilium d. Pilus e. Peritrichous flagella