An embryo is known as a fetus by the ________ week of pregnancy
A) first
B) second
C) fourth
D) ninth
E) twelfth
D
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The acid-base buffer systems in blood include
A. bicarbonate buffer system. B. phosphate buffer system. C. protein buffer system. D..All of these are correct.
Which digestive structure is commonly called the "throat?"
A) Esophagus B) Pharynx C) Oral cavity D) Small intestine
What are the structural differences between the left and right lungs?
A) The left lung has two lobes, whereas the right lung has three lobes, the left lung features a groove for the aorta and cardiac depression/notch, and the left lung contains one fissure, whereas the right lung contains two fissures. B) The left lung has three lobes, whereas the right lung has two lobes, the left lung features a groove for the aorta and cardiac depression/notch, and the left lung contains two fissures, whereas the right lung contains one fissure. C) The left lung has one lobe, whereas the right lung has three lobes, the right lung features a groove for the aorta and cardiac depression/notch, and the left lung contains one fissure, whereas the right lung contains two fissures. D) There are no differences in the structure of the left and right lungs.
Tears
A. are very acidic and kill microbes. B. contain lysozyme to trap dust. C. wash foreign objects away from the eye. D. contain little water. E. are produced only when a person cries.