Gas exchange and transport

Which of the following does NOT describe the surface across which gas exchange occurs in the mammalian lung?

• The surface must be moist, as gases must dissolve in water to diffuse across the membrane.

• The surface must have a greater concentration of the waste gas on the alveolar side of the membrane than the other, so the a concentration gradient is maintained.

• To provide adequate gas exchange, the surface must have a large SA:V

• To enable rapid diffusion of gas molecules, the surface must be thin and permeable.

The tiny air sacs located on the end of a bronchiole are called

• Aioli

• Alveoli

• Bronchioli

• Aerioli

What type of cell lines the alveolar wall?

• Epithelial cells

• Endometrial cells

• Endothelial cells

• Capillary cells

The correct order for the passage of air into the lungs is

• Bronchi - trachea - bronchioles - alveoli

• Bronchi- bronchioles - trachea - alveoli

• Trachea - bronchioles - bronchi - alveoli

• Trachea - bronchi - bronchioles - alveoli

What is the name of the network of tiny blood vessels called?

• Veins

• Arteries

• Capillaries

• Vessels

What is protein in red blood cells that carries oxygen?

• Haemoglobin

• Oxyglobin

• Erythrocyte

• Hemocyte

Which type of blood vessel carries blood away from the heart?

• Capillary

• Vein

• Artery

• Venule

When you breathe in, your alveoli fill up with oxygen from the air. Explain where the oxygen travels to next. (Remember: explain means how and why)

According to the table, predict the direction of oxygen movement from the capillary entering the muscle tissue and the muscle tissue. Provide reasons for your answer.

Explain the effect on (a) the speed of diffusion and (b) the number of molecules diffusing when there is a large difference in the partial pressure across two sites.