packet 2 part 1

Question 1

events of resp: pulmonary respiration

Answer 1

moving air in + out of lungs, or breathing

Question 2

events of resp: external respiration

Answer 2

gas exchange between pulmonary blood + alveoli

gas exchange made between blood and body exterior

Question 3

events of resp: respiratory transport

Answer 3

oxygen and carbon dioxide must be transported to and from lungs and tissue cells via bloodstream

Question 4

events of resp: internal celllular respiration

Answer 4

at systemic capillaries

gas exchange between blood + tissue cells

Question 5

pulmonary ventilation

Answer 5

completely mechanical process

depends on volume changes in thoracic cavity

volume changes lead to pressure changes lead to flow of gases to equalize pressure

Question 6

pulmonary ventilation has two phases

Answer 6

inspiration: flow of air into lung
expiration: air leaving lung

Question 7

boyle’s law

Answer 7

states that at constant temperature, pressure of gas (P) varies inversely with volume (V)

P1V1 = P2V2 (1/2 indicate initial and resulting conditions)

smaller container will increase gas pressure

Question 8

respiratory pressure is always relative to

Answer 8

atmospheric pressure (Patm): pressure exerted by gases surrounding body

at sea level: 760 mm Hg = 1 tm = pressure externed by column of mercury 760 mm high

Question 9

negative + positive respiratory pressure

Answer 9

in any part of resp. tract is lower than Patm (neg)

pressure that is higher than Patm (pos)

Question 10

intrapulmonary pressure Ppul

Answer 10

pressure in alveoli, rises + falls w/ breathing and ultimately equalizes

Question 11

intrapleural pressure Pip

Answer 11

pressure in pleural cavity, rises + falls w/ breathing

always negative to Ppul, if equal to Ppul lungs collapse

Question 12

transpulmonary pressure

Answer 12

difference between Ppul-Pip

prevents lungs from collapsing

760 mm Hg - 756 mm Hg = 4 mm Hg