Gas exchange

A disc shaped cell with no nucleus that contains hemoglobin, and that transports oxygen in the circulatory system.

• Red blood cell

• Hemoglobin

• Emphysema

• Asthma

An iron-rich protein in red blood cells that allows the cell to   absorb oxygen.

• Red blood cell

• Hemoglobin

• Emphysema

• Asthma

Condition of the lung in which the surface area of the alveoli decreases, making breathing difficult.

• Red blood cell

• Hemoglobin

• Emphysema

• Asthma

Condition in which the air pathways in the lungs constrict, making breathing difficult.

• Red blood cell

• Hemoglobin

• Emphysema

• Asthma

Oxygen diffuses from:

• Alveoli into the capillary

• Capillary into the alveoli

Carbon dioxide diffuses from:

• Alveoli into the capillary

• Capillary into the alveoli

Oxygen binds to .................... in the red blood cells.

• Hemoglobin

• alveoli

• capillary

• carbon dioxide