Human Gas Exchange

What is the name of two main branches from the trachea (one to each lung)?

• bronchi

• alveoli

• capillaries

• bronchioles

What happens when you breathe in? (tick all that apply)

• diaphragm relaxes and moves up

• diaphragm contracts and flattens

• increases volume in thorax

• reduces volume in thorax

Which of the following is not happening during inhalation?

• the diaphragm contracts

• the rib cage rises up

• expands the volume of the chest cavity

• diaphragm is relaxing

A contraction of the diaphragm during inhalation causes it to flatten. What else does the contraction result in?

• An increase in the volume of the thoracic cavity

• Increase in alveolar pressure

• A decrease in lung volume

• A decrease in the volume of the thoracic cavity

What happens when the external intercostals contract during inhalation?

• The diaphragm relaxes

• The ribs are elevated

• Pressure in the lungs increases

• The size of the thoracic cavity decreases

Given the following structures:
1. larynx
2. nasal cavity
3. pharynx
4. trachea
Which of the following is the correct order that air would flow during inhalation. 

• 1,2,3,4
• 2,3,1,4
• 2,1,3,4
• 4,2,3,1 

The main function of cilia which line the respiratory surface is to

• Moisten the trachea

• Lubricate the bronchi to ease the flow of air into the lungs

• Move the mucus to the pharynx and away from the lungs

• Provide mucus to the lungs to prevent the lungs from dehydration

What happens when you breathe in? (tick all that apply)

• diaphragm relaxes and moves up

• diaphragm contracts and flattens

• increases volume in thorax

• reduces volume in thorax

• pressure in thorax lower than outside

Tubifex worms are small, thin animals that live in water. They have no specialised gas exchange or circulatory system. Name the process by which oxygen reaches the cells inside the body of a tubifex worm.

• active transport

• respiration

• diffusion

• facilitated diffusion

What is tidal volume?

• the volume of air inspired per minute

• The amount of air left in the lungs after expiration

• Volume of air expired per breath at rest

• volume of air inspired per breath at rest