Question

Which occurs as part of gas exchange?
oxygen is exhaled
carbon dioxide is inhaled
carbon dioxide diffuses from the trachea to blood in capillaries
oxygen diffuses from alveolar sacs to blood in capillaries

Answer 1

@confluxepic @dan815

Answer 2

The oxygen transport is as follow
1. Oxygen diffuses from the alveoli into surropumding capillaries
2. Oxygen enters a red blood cell
3. Oxygen binds to a molecule of hemoglobin
4. Oxygen carried through blood vessels to a capillary
5. Oxygen diffuse from the blood to the body's tissues

Answer 3

so D?

Answer 4

i think D