What are the three cell types of the stomach, and what do each secrete?
What will be an ideal response?
Answer: The chief cells secrete pepsinogen, a pro-enzyme that is converted to pepsin in the stomach lumen. Pepsin is a protein-digesting enzyme. The parietal cells secrete acid. The mucous cells secrete mucous which lines and protects the stomach wall. Endocrine cells secrete histamine, which activates acid secretion in response to food, and somatostatin, which functions in control of gut function.
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Match the following:
A) Fast (oxidative or glycolytic), fatigable fibers B) Slow (oxidative), fatigue-resistant fibers 1) Depends on oxygen delivery and aerobic mechanisms. 2) Have very fast-acting myosin ATPases and depend upon anaerobic metabolism during contraction. 3) Red fibers, the smallest of the fiber types. 4) Contain abundant amounts of glycogen. 5) Abundant in muscles used to maintain posture. 6) A relatively high percentage are found in successful marathon runners.
Based on your knowledge of the structures of the eye and visual pathway, propose several possible causes for blindness. How does the disease glaucoma fit in this scheme?
What will be an ideal response?
The abdominopelvic cavity contains a moist serous membrane called the ________.
A. pericardium B. peritoneum C. meninges D. pleura E. mediastinum
What percent of filtrate becomes urine?
A. less than 1% B. 5% C. 10% D. 80% E. 90%