PracticeExam3B - BISC220 – Exam 3 (Version B) Spring 2006...

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BISC220 – Exam 3 (Version B) Spring 2006 Herrera 1. Hormones that inhibit appetite include ____________ from adipose cells, ____________ from the small intestine, and ______________ from the pancreas. A hormone that stimulates appetite is ________________ from the stomach. 2. Powerful digestive forces operate in the human stomach, but the epithelial cells lining the lumen are not immediately destroyed. Briefly describe the mechanisms that protect the gastric epithelium from damage. 3. Indicate whether each of the following statements is true or false. a. In insects, the composition of the blood is largely different from the fluid that directly bathes the cells of the body. b. A three-chambered heart typically has two atria and one ventricle. c. The elasticity of arteries helps maintain blood pressure during diastole. d. A human red blood cell taking the shortest possible route from the right ventricle to the right atrium must pass through two capillary beds. 4. Congestive heart failure occurs when the left ventricle is weakened so that it cannot fully empty when it contracts. Thus, blood is not efficiently pumped out of the lung and blood pressure in the pulmonary circulation increases. Explain why an increase in pulmonary blood pressure leads to pulmonary congestion, i.e., accumulation of fluid within the alveoli. 5. The pacemaker of the human heart is located in the _______________. From there, excitation spreads directly across both ____________. Excitation of the __________ activates ___________ in the septum between the
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This note was uploaded on 04/25/2008 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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PracticeExam3B - BISC220 – Exam 3 (Version B) Spring 2006...

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