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21 Cards in this Set

  • Front
  • Back
blood form pulmonary capillaries going to left ventricle is high in _______ and low _______?
high in O2 and low in Co2
what happens in pulmonary capillaries
O2 is put into blood w/c goes to left ventricle,
Co2 form right ventricle is put into alveolar space
what do systemic capillaries have
they have high Co2 and low O2 b/c they dump their O2 content into metabolizing tissue
a)what happen to the diaphragm when we inhale? exhale?

b) what happens to the thoracic cavity
a)it contracts and gets smaller when we inhale and expands when we exhale

B) it expands during inhalation and contracts during exhalation
going from the mouth to the bottom of an airway, how many division are there? What happens to the size w/each division?
it gets smaller in DM and length till we get to alveoli at the bottom of the airway
where does the gas exchange take place?
it takes place at the in the alveoli and alveolar duct or the last 4 segments
what are alveolar walls made up of?
they are made up of capillaries, with alveolar space on both sides. the distance b/t the capillaries is really short so it allows for a lot of gas exchange
what structure of the lung is air found in?
alveolar space
what does exchange refer to?
it refers to the exchange of gases from alveolar space to the erythrocytes
what cells are responsiblr for formation of surfactant?
type 2 alveolar cells
what is partial pressure of a gas (X)in a mixture of gases
P= mole fraction of gas (X) X total pressure
what 2 gases make up our environment and what are their partial pressures i at room temp settings
O2 21% and N 79%make up our atmosphere.
Total Barometric P = 760 ATM
partial P of O2= .21x760= 160
partial P of N2= .79X760= 600
what gases make up our airways pressures? what are the partial pressures of each?
O2,N2, and Water vapor
water Vapor P= 47
since total P is the sum of all 3> 760= O2+N2+47
713= O2+N2 use the same formula as room temp to figure out the rest
what does water vapor P depend on
it depends solely on Temprature
is the O2 P higher in the airways or in the Atmosphere
it is higher in the atmosphere b/c in airways total pressure is 47 (due to water vapor P)less than normal
how is partial pressure gas of in the fluid measured
it is measured by the solubility coefficeint but the main idea is that gases in fluids move down partial pressure, until eq os reached
what happens at equillibrium
the amount of gas moving from alveolar space into blood=amount of gas from blood into the alveolar spacewhat ar
how do you know that the exchanger you have is a good one
an exchanger is good if the Partial P of expired O2 = Partial P int he blood, i.e P Alv O2= PaO2
what is the difference b/t A and A refer to
it refers to how goos an exchanger is, if the difference is big, exchanger is no good
what are the factors that determine what is a good exchanger
1)area of contact b/t gas and blood compartments, bigger the area better it is
2) thickness of the membrane b/t the two, thinner the membrane better an exchnager
3)solubility of the gas in th membrane, more soluble it is better it is exchnaged
4) the conc'n gradient b/t the compartment, exchange is directly proportional to the conc'n if partial pressures b/t the gas and bllod compartments
5) matching, of gas and blood, both have to be delievered equally
what is matching
its the most imp factor in determining a good exchanger, it is perfusion vs ventillation
ideal situation would be to completely match ventillation with perfusion