39. Surfactant A. protects the surfaces of the lungs. B. is not found in healthy
ID: 3520552 • Letter: 3
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39. Surfactant A. protects the surfaces of the lungs. B. is not found in healthy lung tissue. C. helps prevent alveoli from collapsing. a ponadised in somosts D. is 40. Air entering the respiratory bronchioles A. has passed through the conducting portion of the respiratory tract. g: has passed through the respiratory portion of the respiratory tract D. A and B are correct. B. has been warmed, filtered, and humidifed E. B and C are correct. dl Walich of the folowing is a correct diflerence between non-specific and specife defenses? A. Non-specific defenses are developed in the body after birth, due to exposure B. The non-specific defenses are the first to be activated when a bacterial infection occurs C. Specific defenses are present at birth. D. Cell-mediated immunity is a type of non-specific defense. 42. Which will cause a GREATER diameter of bronchioles? A. sympathetic activation B. parasympathetic activation 43. When compliance decreases, A. a person has emphysema. B. more energy is required for breathing. C. the lungs are healthy D. gas exchange is inhibited. 44. Scientists have recently discovered that nitric oxide (NO) is a neurotransmitter that causes smooth muscle cells to relax. Therefore, A. when NO is released, vasoconstriction will occur B. when NO is released, vasodilation will occur C. NO is only important in the central nervous system. D. capillary blood flow will decrease after NO is released. 45. For ventricular filling to occur A. the AV valves need to be open. B. the semilunar valves need to be open. C. the atria need to be relaxed. D. all valves need to be closed.Explanation / Answer
39. Surfactant
C. Helps prevent the alveoli from collapsing.
During expiration when there is low pressure in the alveoli then it comes in play . It is secreted by the lungs.
40. Air entering the bronchioles
D. Both A and B are correct.
The conducting portion of respiratory tract is upto the bronchioles. And its main function is to warm and humidify the air entering the lungs.
41. D. Is correct regarding the difference between specific and non specific defense mechanism .
Non specific defense is with which we are born and speicific defence we acquire after birth by having exposure to any antigen. It is mediated by antibody production while the non specific is mediated by the cells.
42. Which will cause a greater diameter of brochioles.
A. Sympathetic activation .
It causes dialation of bronchioles.
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