Which of the following statements about surface tension is false? O a. In alveoli, water molecules are more strongly attracted to each other than they are to the gas molecules. O b. Surface tension occurs at any gas-liquid boundary. O c. Surface tension resists any force that tends to increase the surface area of the gas-liquid boundary. O d. Surface tension acts to increase the size of the alveoli within the lungs. O e. Molecules of a liquid are more strongly attracted to each other than they are to gas molecules. Which of the following statements about lung surfactant is false? O a. O b. Surfactant reduces the amount of work required to inflate the lung. Surfactant works by increasing the attraction of water molecules to each other O c. Surfactant is a detergent-like mixture of lipids and peptides (short chains of amino acids) that decrease surface tension.

Which of the following statements about surface tension is false? O a. In alveoli, water molecules are more strongly attracted to each other than they are to the gas molecules. O b. Surface tension occurs at any gas-liquid boundary. O c. Surface tension resists any force that tends to increase the surface area of the gas-liquid boundary. O d. Surface tension acts to increase the size of the alveoli within the lungs. O e. Molecules of a liquid are more strongly attracted to each other than they are to gas molecules. Which of the following statements about lung surfactant is false? O a. O b. Surfactant reduces the amount of work required to inflate the lung. Surfactant works by increasing the attraction of water molecules to each other O c. Surfactant is a detergent-like mixture of lipids and peptides (short chains of amino acids) that decrease surface tension.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter13: The Respiratory System

Section: Chapter Questions

Problem 5TAHL

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Oxygen in air must diffuse across______ to enter the blood. a. pleural sacs b. alveolar sacs c. a moist respiratory surface d. both b and c
The following are the factors that affect rate of diffusion across respiratory membrane: a. Membrane thickness. b. Molecular weight and solubility of the gas. c. All of the above correct. d. Surface area. e. Partial pressure difference across respiratory membrane.
Which Of the followings are TRUE? Select one: O a. Cellular respiration - Gas exchange between blood and tissue cells b. Pulmonary ventilation – Conducting zone O c. Respiratory zones Site of gas exchange O d. Internal respiration - CO2 is used by the cells O e. External respiration - Continuous replacement of gases in alveoli One of the following are not correct ?
What occurs as air descends down through the conducting zone and respiratory zone structure? a. Cartilage rings are replaced by plates of Cartilage. b. Resistance to air flow decreases due to increased number of lobbies. c. Resistance to air flow increases as bronchioles diminish in diameter. d. Smooth muscle surrounding the bronchioles increases . e. The lining of the bronchioles changes from ciliated columnar to simple squamous epithelium.
WHich of the following finding at the apex best explains why ventilation-perfusion ratios are higher at the apex than base of a normal upright lungs? a. Alveolar Po2 is higher b. Alveoli contains more elastin and less collagen c. Alveoli have less surfacant d. Change in pleural pressure with each breathe is higher e. Perfusion is lower
Which of the following is NOT a determinant of gas exchange as described by Fick's Law? a. Steepness of the concentration gradient b. Number of ion channels in alveolar membrane c. Thickness of the alveolar membrane d. Permeability of the alveolar membrane to gases e. Surface area of the alveolar membrane
Which of the following is the primary method by which carbon dioxide is transported to the lungs? a. Dissolved in plasma b. Bound to hemoglobin c. As carbon monoxide d. As bicarbonate
Which of the following statements are true of the alveoli and pulmonary capillaries? (Read carefully and select all of the correct statements.) A. Blood coming into the pulmonary capillaries is low in O2 and high in CO2. B. The alveolar walls are one cell in thickness.C. The total alveoli provide a large surface area for gas exchange.D. The pulmonary capillaries are made of simple squamous epithelium. E. Blood leaving the pulmonary capillaries will return to the left atrium of the heart.
Which of the following best describes the gas exchange that occurs in the lungs? A. carbon dioxide diffuses into the capillaries from the alveoli B. oxygen diffuses from the capillaries into the alveoli C. carbon dioxide diffuses from the capillaries into the alveoli D. oxygen diffuse into the alveoli from the capillaries
The time it takes for blood to pass through the capillaries of a pulmonary alveolus typically is less than 0.3 seconds. During this time, what will occur? Select one: a. The blood plasma will be cleansed of its entire CO2 content and will be saturated with O2. b. An enzyme will catalyze the conversion of oxyhemoglobin to carboaminohemoglobin. c. Blood will pick up CO2 and O2 will be released to the alveolus. d. Blood will pick up O2 and CO2 will be released to the alveolus.I think this is C or D tell me the answer and why
Which of the following statements is CORRECT? Select one: a. Reduction of atmospheric air pressure increases alveolar PO2. b. Reduction of plasma protein in blood increases alveolar PO2. c. Increase in ventilation increases alveolar PO2. d. Increase in metabolism increases alveolar PO2. e. Increase in the amount of hemoglobin increases arterial PO2
Which of the following statements about the lungs of an upright person is true? O A. The ventilation/perfusion ratio is higher at the top of the lung than at the bottom. O B. Blood flow to the top of the lung per gm of tissue is much greater than at the bottom. O C. Ventilation at the top of the lung per gm of tissue is greater than at the bottom O D. The ventilation/perfusion ratio is lower at the top of the lung than at the bottom. OE. None of the above