Gas Exhange

Question 1

What is the partial pressure of gasses when a person inhales the air (atmospheric air)?

Answer 1

Oxygen - 160 mm Hg
Carbon dioxide - <0.3 mm Hg

Question 2

What is the partial pressure of gasses in alveolar air (when the inhaled air travels in the alveoli)?

Answer 2

Oxygen - 104 mm Hg
Carbon dioxide - 40 mm Hg

Question 2

Why does the alveolar air have a different partial pressure as compared to the atmospheric air?

Answer 2

because of the residual air in the lungs

Question 2

The blood entering the lungs carries the following partial pressure of gases:

Answer 2

Oxygen – 40 mm Hg
Carbon Dioxide – 45 mm Hg

Question 3

What is the blood entering the lungs?

Answer 3

Deoxygenated blood

Question 4

In external respiration, oxygen will diffuse on the ______ to the _________

Answer 4

capillaries
blood cells

Question 5

In external respiration, carbon dioxide will diffuse from the _________ to the ___________ and into the __________

Answer 5

blood cells
capillaries
alveoli

Question 6

During the gas exchange in external respiration, the partial pressure of the oxygen and carbon dioxide change until

Answer 6

it reaches the point that both partial pressure of gases in the alveoli and the blood vessel are just the same.

Question 7

When the blood is ready to leave the lungs, the partial pressure of the oxygen _____________. The difference in partial pressure occurs because ___________ draining the bronchi and bronchioles mixes with pulmonary venous blood before returning to the ________. As a result, the PO2 of the left atrial, left ventricular and systemic arterial blood is _________.

Answer 7

drops into a very minimal amount
venous blood
heart
95-100 mm Hg

Question 8

In internal respiration, the blood from the lungs (oxygenated blood) carries the following partial pressure of the gases:

Answer 8

Oxygen – 100 mmHg
Carbon Dioxide – 40 mm Hg

Question 9

In internal respiration, oxygen from the blood cell of blood from the lungs will be detached from the _____ and will be dissolved in ______. It will eventually diffuse towards the ______

Answer 9

hemoglobin
plasma
body tissues

Question 10

In internal respiration (blood from the lungs), oxygen will diffuse from ______ and dissolve in _______ and into the _______. On the other hand, Carbon dioxide will diffuse from the_______ to the ________

Answer 10

blood cells
plasma
body tissue
blood cells

Question 11

In internal respiration, the oxygen from the blood cells diffuse towards the body tissues and the carbon dioxide diffused back to the blood cell, thus changing the partial pressure of both gases in the blood as well. As the blood is ready to be oxygenated again and undergo gas exchange in the alveoli, the partial pressure of gasses is

Answer 11

Oxygen – <40 mm Hg
Carbon Dioxide – >45 mm Hg

Question 12

Partial pressure of blood entering the lungs

Answer 12

Oxygen – 40 mm Hg
Carbon Dioxide – 45 mm Hg

Question 13

Partial pressure during gas exchange

Answer 13

Oxygen – 104 mm Hg
Carbon Dioxide – 40 mm Hg

Question 14

Partial pressure of blood leaving the lungs

Answer 14

Oxygen – 95-100 mm Hg
Carbon Dioxide – 40 mm Hg

Question 15

Partial pressure of blood from the lungs

Answer 15

Oxygen – 100 mm Hg
Carbon Dioxide – 40 mm Hg

Question 16

Partial pressure of blood of body tissues

Answer 16

Oxygen – <40 mm Hg
Carbon Dioxide – >45 mm Hg