Which of the following is the best explanation for why the cells of the proximal convoluted tubule (PCT) contain so many mitochondria?
A) Cells of the PCT go through a great deal of mitosis.
B) A great deal of active transport takes place in the PCT.
C) Contraction of the PCT moves filtrate through the tubule.
D) This provides the energy needed to fight kidney infection.
B
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Match each of the terms with its definition or description.
a. atria b. ventricles c. tricuspid valve d. bicuspid valve e. chordae tendineae f. semilunar g. parietal pericardium h. myocardium i. epicardium j. endocardium 1. _____ Innermost layer of the heart wall 2. _____ Valve separating the right atrium from the right ventricle 3. _____ Valve separating the left atrium from the left ventricle 4. _____ Another term for the visceral pericardium 5. _____ Receiving chambers of the heart 6. _____ Fibrous sac surrounding the heart 7. _____ Valve between a ventricle and an artery 8. _____ Discharging chambers of the heart 9. _____ Stringlike structures that attach to the atrioventricular valves of the heart 10. _____ Muscle layer of the heart
The nucleolus contains
A) RNA only. B) DNA only. C) RNA and protein. D) DNA and protein.
Because insulin promotes __________ synthesis, its growth-promoting effects should not be surprising
Fill in the blank(s) with correct word
The medullary cavity contains
A. red marrow. B. spongy bone. C. the periosteum. D. yellow marrow.