Alveoli Cambridge PreLess

Which of the respiratory organs involved in the gas exchange?

Why alveoli is so tiny?

• To reduce the surface area for gas exchange
• To make breathing difficult
• To store excess air
• To maximize the surface area for gas exchange

How the respiratory organs are organised to maximise the efficiency of gas exchange in the alveoli?

• Wall of capillaries and alveoli are only one-cell thick

• Attached to the bronchioles

• Millions of tiny alveoli

• Capillaries are pressed tightly against the alveoli

• Distance between the capillaries and the alveoli is far

Which of the following are features of the alveoli that adapt them to gas exchange?

I. High surface area

II. Thin walls

III. Dry surfaces

• I and II only

• I only

• II and III

• I, II, and III

what is found around alveoli?

• capillaries

• pleura

• lymphatic nodes

• saliva

What adaptations does the alveoli have for efficient gas exchange?

• thick walls

• thin walls

• small surface area

During gas exchange what enters from alveoli to the capillaries?

• CO₂

• CO

• O₂

• nitrogen

The movement by diffusion of oxygen and carbon dioxide across a membrane

• Ventilation
• Breathing
• Gas exchange
• Respiration

Which of the following features of the respiratory tract helps to warm the inhaled air?

• The nasal cavity has a lot of hair.

• The lining of the trachea is covered with cilia.

• The lining of the respiratory tract is coated with mucus.

• The wall of the nasal cavity is richly supplied with capillaries.

Where does the carbon dioxide in the body originated from?

• Lungs

• Heart

• Atmosphere

• Cell tissues