Which of the following structures increase the surface area of the respiratory system?
A. nasal conchae
B. alveoli
C. larynx
D. both A and B
E. None of the above increase the surface area of the respiratory system.
Ans: D. both A and B
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Devising new food recipes is more successful when the chefs understand basic food chemistry. For example, to create a new cake recipe, one must understand the role of both acids and bases in leavening (rising, or trapping of tiny gas bubbles as dough is baking, to provide the characteristic texture). The principle is to incorporate baking soda (NaHCO3) into an acidic batter, causing a chemical
reaction resulting in gas production. Looking at the chemical formula, what gas do you think is formed? Summarize the chemical reaction that occurs in a cake batter that contains NaHCO3 and vinegar or acetic acid (produces acetate when ionized: CH3COO- + H+). What would happen to your cake if you didn't use enough baking soda? What would happen if you forgot to acidify your batter with vinegar or a similar food acid? What will be an ideal response?
The most common type of neuron in the human body is:
A) unipolar. B) bipolar. C) pseudounipolar. D) multipolar.
The ________ cover(s) the superior portion of the heart and produces a group of hormones known as ________
A) spleen; splenogins B) pancreas; pancreatins C) inguinal lymph nodes; lymph D) thymus; thymosins
The muscularis layer in the wall of the digestive tract is
A. skeletal muscle throughout the tract, especially in the large intestine. B. the layer of the digestive tract wall that contains capillaries. C. in direct contact with the food that is consumed. D. composed of a layer of circular smooth muscle fibers and a layer of longitudinal smooth muscle fibers. E. connective tissue and the peritoneum.