If T-lymphocytes that failed the negative selection test were not destroyed, the immune system would likely
A. be unable to recognize a particular class of pathogen.
B. exhibit more negative membrane potentials.
C. exhibit very delayed activity.
D. cause autoimmune disorders.
Answer: D
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A person with type A blood has ________.
A. anti-A antibodies B. no antigens C. anti-B antibodies D. A and B antigens
Answer the following statement(s) true (T) or false (F)
1. Endocrine glands release their hormones into the blood via a duct system. 2. Hormones are not very specific about the cells they affect. 3. With increasing age, the thymus increases in size. 4. Testosterone is a gonadotropin.
Using Figure 22.3, match the following:
1) Produces enzymes that break down all categories of foodstuffs.
2) Increases surface area for absorption via villi and microvilli.
3) Bacteria process undigested chyme from the small intestine.
4) Only digestive structure with three muscle layers.
5) Receives blood via the hepatic portal system.
6) Contains the brush border enzymes that complete digestion of carbohydrates and proteins.
7) Main function is to filter and process the nutrient-rich blood delivered to it.
8) Produces intrinsic factor.
9) Produces a mucoid barrier.
The lining of the stomach
A) has folds called rugae. B) is covered by thick, viscous mucus. C) is composed of simple columnar cells. D) is constantly replaced. E) All of the answers are correct.