Gas exchange

Gas exchange in humans

Multiple Choice

Given the following structures:
1. alveoli
2. bronchi
3. bronchioles
Which of the following is the correct order in which air would flow after inhalation? 

• 1,2,3
• 2,1,3
• 2,3,1
• 3,2,1

Multiple Choice

Number 11 is pointing to which organ of the Respiratory System?

• Alveoli

• Lungs

• Bronchi Tubes

• Bronchioles

Multiple Choice

The division of the trachea forms

• main bronchi

• alveoli

• lungs

• nose

Multiple Choice

What is the site of gas exchange?

• alveoli

• bronchus

• nose

• trachea

Multiple Choice

The air sacs that are covered with capillaries where gas exchange takes place

• bronchi

• lungs

• oxygen

• alveoli

Open Ended

What is the role of cilia and mucus in protecting us from diseases?

Fill in the Blanks

surfce so gas do not have to diffuse very far

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remove oxygen is quickly so that diffusion can continue

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increase number of molecules that can diffuse at the same time

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prevents cells from drying out

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supply of fresh air keeps up the concentration gradient of oxygen and carbon dioxide

Multiple Select

Events occur during inhalation

• Diaphragm relax

• internal intercostal muscle contract

• Ribs move up and outwards

• lung pressure increase

• Volume increase

Poll

percentage of oxygen in exhaled air

• 21

• 16