What happens to a dust particle that is too small to fall from the inspired air and land in the alveoli?
A) It lands in the respiratory bronchiole, where it is coughed out
B) It lands in the mucociliary ladder, where type II macrophages phagocytize it.
C) It lands in the mucociliary ladder, where it is moved to the trachea to be exhaled.
D) It lands in the bronchi, where it is absorbed.
E) It is inhaled and then exhaled.
Ans: E) It is inhaled and then exhaled.
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You are observing an organism under the microscope and you note that it has a cell wall, no chloroplasts, and a nucleus. Your prediction would be that this organism is a(n) ________.
A. bacterium B. virus C. alga D. fungus E. protozoan
Which statement best describes the movement of water in this system?
a. Water moves in both directions, but net movement is from A to B. b. Water only moves from A to B. c. Water moves in both directions, but net movement is from B to A. d. Water only moves from B to A. e. There is no net movement of water.
Which of the following is involved in the prevention of polyspermy?
A. acrosome of the sperm B. fusion of the sperm and egg nucleus C. depolarization of the egg's plasma membrane D. changes within the corona radiata E. the number of chromosomes contained within the sperm
Which of the following is NOT a characteristic of amphibians?
A. They have lungs. B. They have a cartilaginous skeleton. C. They are ectothermic. D. They have a three-chambered heart. E. They have vertebrae.