Question

38.) Which serous membrane lines the lung cavity?

parietal pericardium

visceral pleura

parietal pleura

39.) What is the purpose of surfactant that lines each alveolus?

It tiggers osmosis which causes fluid to fill the alveolar sac

It reduces the surface tension of water and keeps the alveoli from collapsing

It gives a fluid that can be transported out of the body by the mucociliary escalator.

gives the lungs their elasticity

visceral peritoneum

40.) What characteristic(s) of the respiratory membrane facilitate(s) gas exchange?

large groups of red blood cells in contact with the membrane

large amount of tissue fluid to dissolve the gases

small surface area

simple squamous epithelium of the alveolus and capillaries

41.) The diaphragm contracts during ___________ and relaxes during ___________.

inspiration, expiration

expiration, inspiration

42.) The drop in pressure in the alveoli to below atmospheric pressure will

have no effect on air movement.

push internal air out of the lungs.

draw external air into the lungs.

Answer 1