70. The function of surfactant is a. to reduce the surface tension within each a

Question

70. The function of surfactant is a. to reduce the surface tension within each alveolus b. phagocytosis of inhaled dust and other small particles to prevent the alveoli from collapsing all of the above d. eBoth a& c 71·The ONLY site of gas exchange with "outside" air is in the a. alveoli b. terminal bronchioles e. trachea d. bronchi e. all of the respiratory passageways 72. Which of the following structures are considered to be part of the Respiratory Membrane? 4. 5. 6. Alveolar type II cell membrane Capillary endothelial cell membrane Alveolar type I (squamous) cell 1. Fused basement membrane CT 2. Erythrocyte's plasma membrane 3. Alveolar fluid containing surfactant a. 1,2, 3 b. c. 2, 4, 6 d. e. All of the above 1,2, 5, 6 1,3, 5, 6 73. The main function of the Small Intestine is to absorb nutrients. The greater the surface area, the more absorption is possible. Which of the following "modifications" facilitate this function of absorption? a. Circular folds called plicae circularis b. Finger-like projections of mucosa called villi c Cytoplasmic extensions of epithelial cells called microvilli All of the above Only a & c e. 74. Which of the following is a type of motility in the GI tube? 4. Segmentation in small intestine Deglutition Reflex Mass Movements in Large Intestine 1. 2. Haustral contractions in colon 5. 3. Grinding/mixing motions in stomach 6. Vomiting (reverse peristalsis in esophagus) a. 1,2,3 b. 4,5,6 c. 1, 2, 5,6 d. 2,3, 4, 5, 6 e. 1,2,3,4, 5,6 75. Which of the following statements is NOT true of saliva? c. d. e. It moistens food and aids in compacting of the bolus. It contains enzymes that begin the breakdown (digestion) of proteins. It cleanses the mouth. It dissolves food chemicals (tastants) so that they can be "tasted." All of the statements above are true

Explanation / Answer

70) functions of the surfactant are (option e), the surfactant is a monomolecular layer on the surface of section between the alveoli and air, it is a lipoprotein it functions are a)lowers the surface tension of alveoli and lung, b)promotes stability of alveoli,c)prevents transdation of fluid into alveoli. 71)(option a)alveoli is lined with moist layer oxygen dissolves in the moisture and diffuses through alveoli wall into the blood capillary. 72)(option d) The respiratory membrane consists of capillary endothelium , capillary basement membrane, interstitial space, alveolar basement membrane, alveolar epithelium surfactant layer. 73)(option d)small intestine wall modification increase the surface area they are plicae circulares: deep circular folds of the mucosa, villi: fingerlike extension of the mucosa, microvilli: tiny projections of absorptive mucosal cells plasma membrane. 74)(option e) 75)(option b), chemicaldigestion of the carbohydrates and fats occurs by the saliva.

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