The Respiratory System: Gas Exchange
The atmosphere is a mixture of gases. Write down the percentages for: a. O2 _____21%______
b. CO2 ____0.04%_______
c. N2 _____78%______
d. H2O _____0.46%______
Calculate the partial pressures of the following gases at both atmospheric pressures:
What is the atmospheric pressure on the top of Mt. Whitney? __440mmHg_________ 4.
Calculate the partial pressure of O2 on the top of Mt. Whitney. _92_____mmHg 5.
a. Why does more CO2 than O2 dissolve in liquid when both gases are at
the same pressure?
CO2 is more soluble in liquid than O2
b. Name the law that explains this. _henry’s law_
Efficient external respiration depends on three main factors - list them. a. surface areas and structure of the respiratory membrane b. partial pressure gradients
c. matching alveolar air flow to pulmonary capillary blood flow 7.
What three factors cause the partial pressures of gases in the alveoli to differ from pressures in the atmosphere? a. humidification of the air
b. gas exchange between capillaries and alveoli
c. making of old and new air
When airflow is restricted so that the partial pressure of O2 is low and CO2 is high, what happens to the: a. arterioles? ___vasoconstriction_____________
b. bronchioles? ____dilation____________
Internal respiration depends on three factors - list them.
a. available surface area
b. partial pressure gradients
c. variable rate of blood flow varies
The planet Pneumo has a total atmospheric pressure of 900 mmHg. Oxygen and carbon dioxide each constitute 30% of the atmosphere. a. What is the partial pressure of oxygen...
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