1) The functions of respiratory system include:- a) Transport oxygen to the tissue b) Provides a route for heat and water elimination c) Contributes to maintenance of normal alkaline base-balance d) Produce hormones to increase blood level 2) Lung collapse is prevented by a) high surface tension of alveolar fluid b) high pressure in the plueral cavity c) high elasticity of lung tissue d) adhesion of the plueral membranes 3) Which of the following is FALSE according hemoglobin a) keeps the blood PO² low and favors movement into the blood despite a very large of O² untill hemoglobin is completely saturated b) combines preferentially with O² over any other substance c) Can combine with O²,CO²,H and CO d) Unloads more O² in the presence of increased tissue activity 4) Which of the following changes will accompany the loss of lung elasticity associated with aging? a) Increase in tidal volume b) Increase in inspiratory reserve volume c) Increase in residual volume d) increase in vital capacity 5) During the inspiration,intrapulmonary pressure is a) less than atmospheric pressure b) greater than atmopheric pressure c) less than intraplueral cavities d) high elasticity of lung tissue 6) Which of the choices below is NOT a functional process performed by the respiratory system? a) Pulmonary ventilation b) External respiratory c) Transport of respiratory gases d) Pulmonary respiration 7) With the Bohr effect,more oxygen is released because a(an) ______________in PH ___________ the oxygen-hemoglobin a) increase,weakens b) decrease,weakens c) increase ,strengthens d) decrease,strengthens 8) Which of the following does NOT bring about increased airway resistance a) Emphysema b) Asthma c) Epinephrine d) Excess mucus production 9) Which of the following is the last step that produces an inspiration? a) the intercostals muscles contract b) the atmospheric pressure become lower than the intraplueral pressure c) the diaphragm contracts d) the intra-alveolar pressure becomes lower than the atmospheric pressure 10) Which of the following reactions takes place at the pulmonary capillaries? a) HbH→Hb + H+ b) Hb + O² → HBO² c) CO2 + H2O → H2CO3 → H+ + HCO 3 d) Hb + CO 2 →HbCO 2

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