Which of the following describes the net direction of diffusion of gases at pulm

Question

Which of the following describes the net direction of diffusion of gases at pulmonary capillaries?

a. oxygen into blood, carbon dioxide into blood

b. oxygen out of blood, carbon dioxide into blood

c. oxygen into blood, carbon dioxide out of blood

d. oxygen out of blood, no net movement of carbon dioxide

e. oxygen out of blood, carbon dioxide out of blood 1 points

QUESTION 2 Which of the following will cause a shift in the hemoglobin-oxygen dissociation curve to the right (increase oxygen unloading)?

a. increase in 2,3-bisphosphoglycerate (BPG) only

b. an increase in temperature or an increase in plasma pH

c. increase in plasma pH only

d. an increase in temperature or an increase in BPG e. increase in temperature only 1 points

QUESTION 3 Most of the oxygen transported by the blood is

a. bound to hemoglobin.

b. as carbamino compounds.

c. bound to plasma proteins.

d. dissolved in the cytosol of red blood cells.

e. dissolved in plasma. 1 points

QUESTION 4 Which of the following regions of the respiratory tract is lined with stratified squamous epithelium?

trachea

olfactory epithelium

nasopharynx

alveoli of the lungs

pharynx 1 points

QUESTION 5 The following is a list of some of the structures of the conducting & respiratory zones.

1. secondary bronchi 2. tertiary bronchi 3. alveolar ducts 4. primary bronchi 5. respiratory bronchioles 6. bronchioles 7. terminal bronchioles The order in which incoming air passes through these structures is

a. 1,4,2,5,7,3,6

b. 1,4,2,7,5,3,6

c. 4,1,2,5,7,3,6

d. 4,1,2,6,7,5,3

e. 2,4,1,7,5,3,6 1 points

QUESTION 6 The respiratory membrane is a combination of:

a. respiratory bronchioles and alveolar ducts.

b. atria and alveolar sacs.

c. respiratory bronchioles and alveolar sacs.

d. alveolar sacs and alveolar ducts.

e. alveolar and capillary walls and the basement membrane in-between them. 1 points

QUESTION 7 _____ cells become more abundant as you move deeper into the conducting zone (from bronchi to bronchioles).

a. Type I alveolar

b. Cartilaginous

c. Smooth muscle

d. Ciliated

e. Goblet 1 points

QUESTION 8 Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by:

a. osmosis. b. filtration. c. diffusion. d. active transport. e. exocytosis. 1 points

QUESTION 9 External respiration involves the

a. movement of air into and out of the lungs.

b. utilization of oxygen by tissues to support metabolism.

c. exchange of dissolved gases between the blood and the interstitial fluid.

d. diffusion of gases between the alveoli and the circulating blood.

e. binding of oxygen by hemoglobin. 1 points

QUESTION 10 In order to transport bicarbonate out of the erythrocyte while maintaining electroneutrality,a ___________ ion is transported into the erythrocyte at the same time bicarbonate moves out.

a. phosphate b. sulfate c. hydrogen d. sodium e. chloride 1 points

QUESTION 11 Secondary bronchi supply air directly to the

a. lobes of the lungs. b. alveoli. c. lobules of the lungs. d. bronchopulmonary segments. e. lungs. 1 points

QUESTION 12 ____ states that the total pressure of a gas mixture is equal to the sum of the partial pressures of its individual gases.

Boyle's law

Valsalva's law

Dalton's law

Charles's law

Henry's law 1 points

QUESTION 13 In quiet (tidal) breathing

a. inspiration and expiration involve muscular contractions. b. inspiration is passive and expiration involves muscular contractions. c. inspiration involves muscular contractions and expiration is passive. d. inspiration and expiration are both passive processes. e. none of the above. 1 points

QUESTION 14 One benefit from air passing by the nasal conchae is they separate airflow from food and drink. the air is warmed & humidified before entering the lower respiratory tract. they filter CO2 from the air. they increase its oxygen concentration. this is where odors are detected. 1 points

QUESTION 15 As the lungs expand, intrapulmonary pressure ______ and air moves ______ the lungs.

a. decreases; into b. decreases; out of c. increases; out of d. does not change; neither into nor out of e. increases; into 1 points

QUESTION 16 The conversion of CO2 to bicarbonate in the blood occurs primarily within the ___________.

a. capillary endothelial cells b. plasma c. alveolar epithelial cells d. leukocytes e. erythrocytes 1 points

QUESTION 17 Intrapulmonary pressure is the

a. difference between atmospheric pressure and respiratory pressure. b. negative pressure in the intrapleural space. c. difference between alveolar and intrapleural pressure. d. pressure within the pleural cavity. e. pressure within the alveoli of the lungs. 1 points

QUESTION 18 The structure that shields the opening to the larynx during swallowing is the ___________.

a. thyroid cartilage b. cuneiform cartilage c. epiglottis d. corniculate cartilage e. cricoid cartilage 1 points

QUESTION 19 Which of the following best describes the change in partial pressure of oxygen of blood as it moves through the pulmonary circuit and then the systemic circuit? rises, then falls falls then rises remains unchanged 1 points

QUESTION 20 Which of the following would slow down gas exchange between the blood and alveolar air?

an increase in oxygen solubility

an increase in alveolar surface area

an increase in membrane thickness

an increase in respiratory rate

Explanation / Answer

Question 1:

C. As the blood is rich in carbon dioxide and pulmonary alveoli rich in oxygen the both will be diffused simultaneously into the blood and alveoli. Oxygen enters the blood and carbon dioxide moves out of blood.

Question 2:

D. An increase in temperature and increase in 2,3- BPG makes the oxygen dissociation curve to into right side.

Question 3

A.

Question 5: d

Question 6:e

Question 8:c

Question 9:a

Question 11:a

Question 12: Dalrons law

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