Question

Name the red pigment inside red blood cells that help to carry oxygen.

Name the large blood vessel that carries blood from heart to lungs
Using what you know about particle theory, explain how oxygen diffuses from an air sac into the blood
The walls of the air sacs and the capillaries are both very thin. Suggest how this helps gas exchange to take place quickly.

Answer 1

Hemoglobin.pulmonary artery.

Step-by-step explanation:

1. about hemoglobin.Hemoglobin is the protein inside red blood cells. It carries oxygen.

2. about pulmonary artery.The pulmonary artery is a big artery that comes from the heart. It splits into two main branches, and brings blood from the heart to the lungs. At the lungs, the blood picks up oxygen and drops off carbon dioxide. The blood then returns to the heart through the pulmonary veins.

3. There exist a concentration difference of carbon dioxide and oxygen inside the alveoli and capillaries due to which the diffusion of the two gases takes place. The carbon dioxide moves from the blood to the alveoli sac and the oxygen moves from the sacs to the blood.