Gas Exchange in Air Sacs Quiz

Oxygen Transfer and Blood Circulation

• The process of oxygen movement from air into the blood is called diffusion.
• Blood inside the capillaries primarily comes from pulmonary circulation, where oxygen-poor blood is transported from the heart to the lungs.
• Once oxygen enters the blood, it binds to hemoglobin molecules in red blood cells, forming oxyhemoglobin for transport to tissues.
• The primary gas present in the air sacs, known as alveoli, is oxygen, with carbon dioxide also present due to gas exchange.
• Oxygen moves from the air to the blood mainly due to concentration gradients, where it moves from an area of higher concentration (alveoli) to lower concentration (blood).
• The term for the process of oxygen combining with hemoglobin in red blood cells is called oxygenation.