Describe the structural characteristics of the small intestine that enhance its function as the major absorber of nutrients
What will be an ideal response?
All structures increase surface area to increase the rate of reabsorption: great length (10' in living humans), microvilli on plasma membrane of each epithelial cell, villi (fingerlike projections of mucosa), and circular folds (permanent ridges in the mucosa).
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A sample of damaged tissue indicated the presence of eosinophils. This finding signifies that the tissue is
A) normal. B) being rejected. C) inflamed. D) infected by parasites. E) None of the answers are correct.
Thin ________ cells line the surface of the alveoli and allow for efficient gas exchange.
What will be an ideal response?
Which of the following arteries provides the abdominal parts of the esophagus with its arterial supply?
(A) cystic (B) gastroduodenal (C) left gastric (D) hepatic (E) left gastroepiploic
Which of the following statements concerning sebaceous glands is false?
A. Most sebaceous glands are connected by a duct to the upper portion of the hair follicle. B. Sebaceous glands are an example of apocrine glands. C. Secretions from sebaceous glands provide protection against bacteria. D. Sebaceous secretions are lipid soluble. E. Secretions from sebaceous glands oil the hair and skin.