Respiratory System

What is partial pressure?

• The pressure exerted by a particular liquid in a mixture

• The pressure exerted by a particular gas in a mixture of gases

• The total pressure exerted by all gases in a mixture

• The pressure exerted by solids in a mixture

Does the concept of partial pressure apply to gases dissolved in liquids?

• No, it only applies to gases in the air

• Yes, but only for gases dissolved in oil

• Yes, it also applies to gases dissolved in liquids such as water

• No, it is not applicable to any dissolved gases

Is oxygen (O₂) more soluble in water or in air?

• More soluble in water

• More soluble in air

• Equally soluble in water and air

• Oxygen is not soluble in water or air

Why does obtaining oxygen from water require greater efficiency than air breathing?

• Because water contains more oxygen than air

• Because breathing air is more difficult than water breathing

• Because there is less oxygen available in water than in air

• Because oxygen is more soluble in water than in air

What is the O₂ partial pressure of air at sea level?

• 160 mm

• 7 mm

• 1 mm

• 210 mm

How does gas exchange across respiratory surfaces take place?

• By active transport

• By diffusion

• By osmosis

• By filtration

Where in the lungs does the gas exchange take place?

• In the trachea

• In the bronchi

• In the alveoli

• In the pleura

What is the term for the volume of air inhaled with each breath?

• Vital capacity

• Residual volume

• Tidal volume

• Breathing rate

What is the term for the maximum tidal volume?

• Tidal volume

• Residual volume

• Vital capacity

• Breathing rate

What is the term for the air that remains in the lungs after exhalation?

• Tidal volume

• Residual volume

• Vital capacity

• Breathing rate