Late one night, while studying for your anatomy class, you open a box of saltine crackers to do a little snacking. After chewing on a starchy morsel for a few minutes, you begin to notice a sweet taste in your mouth. What accounts for this?
A. Esophageal reflux
B. Phagocytosis by the pharyngeal tonsils produces by-products that taste sweet
C. "Sweet" taste receptors are slower to respond than others
D. Activity of bacteria in the mouth lowers the pH
E. Salivary amylase activity
Answer: E
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A person normally has two alleles of a gene because
A) all genes come in only two varieties. B) there isn't enough DNA to accommodate more than this. C) one allele of a gene is carried on each of two homologous chromosomes. D) DNA only comes in two forms.
In the lungs, the grapelike outpouchings of epithelium and elastic basement membrane surrounded externally by a capillary network are called ____
a. alveoli b. septa c. bronchi d. meatus
Answer the following questions true (T) or false (F)
1. Cross-sectional area increases as arteries branch into smaller vessels, causing the blood to flow more slowly. 2. Mean arterial pressure generally measures around 120/80 mm Hg. 3. Increase or decrease in blood oxygen concentration triggers the baroreceptor reflex, which is regulated by the medulla of the brainstem.
Lymphocytes can develop into cells that secrete defense proteins against disease. Some of these cells are termed plasma cells, while their proteins are called
A) collagen. B) fibrin. C) elastin. D) antibodies. E) antigens.