03 Exchange of Respiratory Gases

Question 1

Breathing

Answer 1

• Physical process of moving air into and out of the body
• Involves inhalation and exhalation
• Allows respiration to take place

Question 2

External Respiration

Answer 2

• In lungs
• Oxygen goes from the alveoli to the capillaries and Carbon Dioxide goes from the capillaries to the alveoli

Question 3

Internal Respiration

Answer 3

• In body tissues
• Oxygen goes from the capillary to the body cell and Carbon Dioxide goes from the body cell to the capillary

Question 4

Cellular Respiration

Answer 4

• Within cell
• Allows cell to get energy out of glucose by using oxygen gas to break the bonds
• Results in creation of carbon dioxide as a waste product

Question 5

How to transport oxygen in the blood?

Answer 5

• Oxygen attaches itself to the hemoglobin in the red blood cells
• Carbon dioxide can also do this but mostly dissolves into plasma in blood
• Changes pH of the blood making it more acidic
• Chemoreceptors in body monitor the pH, when it gets too low it sends a message to the brainstem, which sends a message to the ribs and diaphragm which causes you to breathe
• When breathing you remove carbon dioxide from blood and so the blood pH returns to normal