Respiratory System

Multiple Choice

What is the purpose of the respiratory system?

• takes in oxygen and releases nitrogen

• takes in carbon dioxide and releases oxygen

• takes in oxygen and releases carbon dioxide

• takes in nitrogen and releases oxygen

Reorder

Put in order of smallest to largest.

(What combines to create what?)

• cell

• Tissue

• organ

• Organ system

• Organism

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

The respiratory system has many functions. Besides helping you inhale (breathe in) and exhale (breathe out), it:

• Allows you to talk and to smell.

• Warms air to match your body temperature and moisturizes it to the humidity level your body needs.

• Delivers oxygen to the cells in your body.

• Removes waste gases, including carbon dioxide, from the body when you exhale.

• Protects your airways from harmful substances and irritants.

The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi. The bronchi then divide into smaller and smaller branches (bronchioles), finally becoming microscopic.

The bronchioles eventually end in clusters of microscopic air sacs called alveoli. In the alveoli, oxygen from the air is absorbed into the blood. Carbon dioxide, a waste product of metabolism, travels from the blood to the alveoli, where it can be exhaled.

Multiple Select

What two gasses are exchanged in the alveoli?

• Oxygen

• Carbon

• Carbon Dioxide

• Hydrogen

Multiple Choice

What are the clusters of air sacs that are at the end of the bronchioles

• Trachea

• Bronchi

• Capillaries

• Alveoli

Respiratory Diagram

Match the letters with the organ of the Respiratory System?

Letter A Nose

Letter B Trachea

Letter C Lungs

Letter D Diaphragm

Multiple Choice

Letter B is pointing to which organ of the Respiratory System?

• Nose

• Trachea