Gaseous exchange

Gaseous exchange occurs in the alveoli and blood capillaries. What is the name of the process?

• Active transport
• Osmosis
• Filtration
• Diffusion

During gaseous exchange oxygen is delivered to the blood stream. What substance is removed?

• Ozone
• Hydrogen
• Carbon dioxide
• Nitrogen

When there is a higher concentration of oxygen in the alveoli and lower concentration in the blood vessel what occurs?

• Oxygen diffuses from the alveoli into the blood.
• Oxygen is absorbed by the alveoli from the blood.
• Carbon dioxide diffuses from the blood into the alveoli.
• Oxygen remains in the alveoli without moving to the blood.

What is the impact does exercise have on diffusion?

• Exercise has no effect on concentration gradients.
• Exercise slows down the process of diffusion.
• Exercise increases the speed of diffusion due to an increase in metabolic activity

• Exercise decreases metabolic activity, reducing diffusion.

How does the concentration gradient affect the rate of diffusion in the lungs?

• Diffusion occurs only when there is no concentration gradient.

• A steeper concentration gradient slows down diffusion.

• A steeper concentration gradient speeds up diffusion.

• The concentration gradient has no effect on diffusion.

What happens to carbon dioxide levels in the blood during vigorous exercise?

• Carbon dioxide levels decrease due to increased breathing rate.

• Carbon dioxide is converted into oxygen during exercise.

• Carbon dioxide levels remain constant regardless of exercise.

• Carbon dioxide levels increase due to higher metabolic activity.

What happens to the rate of diffusion if the surface area of the alveoli is increased?

• The rate of diffusion increases.

• The rate of diffusion stops completely.

• The rate of diffusion remains unchanged.

• The rate of diffusion decreases.

What role do the alveoli play in the respiratory system?

• They filter out dust and particles from the air.

• They are the site of oxygen and carbon dioxide exchange.

• They transport oxygen to the body's cells.

• They produce mucus to trap bacteria.

How does an increase in altitude affect oxygen availability in the lungs?

• Oxygen availability increases due to higher air pressure.

• Oxygen availability remains constant regardless of altitude.

• Oxygen availability decreases due to lower air pressure.

• Oxygen availability increases due to lower air pressure.

Which factor can increase the rate of oxygen diffusion into the blood?

• Decreased surface area of the alveoli.

• Increased thickness of the alveolar membrane.

• Increased partial pressure of oxygen in the alveoli.

• Decreased blood flow to the lungs.