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# 23.2: The Respiratory System

Difficulty Level: At Grade Created by: CK-12

## Lesson 23.2: True or False

Name___________________ Class______________ Date________

Write true if the statement is true or false if the statement is false.

_____ 1. The exchange of gases between the body and the outside air is called breathing.

_____ 2. Respiration begins with gas exchange.

_____ 3. Respiration and cellular respiration are different.

_____ 4. Pulmonary gas exchange occurs in the alveoli of the lungs.

_____ 5. Asthma is a disease in which the air passages of the lungs periodically become too large.

_____ 6. Oxygenated blood is transported by the respiratory system from lungs to tissues throughout the body.

_____ 7. The mouth is an organ of the respiratory system.

_____ 8. Ventilation is the process of moving air into and out of the lungs.

_____ 9. Pulmonary gas exchange is the exchange of gases between inhaled air and the blood.

_____ 10. The heart pumps the oxygen-rich blood into your veins, which carry it throughout the body.

_____ 11. Body cells have a much higher concentration of oxygen than blood in the peripheral capillaries.

_____ 12. The regular, rhythmic contractions of the diaphragm are controlled by the brain stem.

_____ 13. Carbon dioxide from body cells travels in the blood back to the heart, then to the lungs where it is inhaled again.

_____ 14. Emphysema is a lung disease usually caused by smoking and is irreversible.

_____ 15. Gas exchange is extremely important in maintaining homeostasis.

Name___________________ Class______________ Date________

Read these passages from the text and answer the questions that follow.

Journey of a Breath of Air

Take in a big breath of air through your nose. As you inhale, you may feel the air pass down your throat and notice your chest expand. Now exhale and observe the opposite events occurring. Inhaling and exhaling may seem like simple actions, but they are just part of the complex process of respiration, which includes these four steps:

1. Ventilation.
2. Pulmonary gas exchange.
3. Gas transport.
4. Peripheral gas exchange.

Ventilation

Respiration begins with ventilation. This is the process of moving air in and out of the lungs. The lungs are the organs in which gas exchange takes place between blood and air.

• Air enters the respiratory system through the nose. As the air passes through the nasal cavity, mucus and hairs trap any particles in the air. The air is also warmed and moistened so it won’t harm delicate tissues of the lungs.
• Next, the air passes through the pharynx, a long tube that is shared with the digestive system. A flap of connective tissue called the epiglottis closes when food is swallowed to prevent choking.
• From the pharynx, air next passes through the larynx, or voice box. The larynx contains vocal cords, which allow us to produce vocal sounds.
• After the larynx, air moves into the trachea, or wind pipe. This is a long tube that leads down to the chest.
• In the chest, the trachea divides as it enters the lungs to form the right and left bronchi. The bronchi contain cartilage, which prevents them from collapsing. Mucus in the bronchi traps any remaining particles in air. Tiny hairs called cilia line the bronchi and sweep the particles and mucus toward the throat so they can be expelled from the body.
• Finally, air passes from the bronchi into smaller passages called bronchioles. The bronchioles end in tiny air sacs called alveoli.

Questions

1. Describe the journey of air during ventilation.

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2. What happens to air in the nasal cavity?

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3. What is the role of the larynx?

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4. What happens in the bronchi?

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5. Where are the alveoli located?

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## Lesson 23.2: Multiple Choice

Name___________________ Class______________ Date________

Circle the letter of the correct choice.

1. The functions of the respiratory system include which of the following? (1) bringing air containing oxygen into the body, (2) releasing carbon dioxide into the atmosphere, (3) exchanging oxygen with carbon dioxide in blood cells, (4) transporting oxygen to cells throughout the body.
1. 1 only
2. 1 and 2
3. 1, 2, and 3
4. 1, 2, 3, and 4
2. The four steps of respiration are
1. ventilation, central gas exchange, gas transport, peripheral gas exchange.
2. ventilation, pulmonary gas transport, gas exchange, peripheral gas transport.
3. ventilation, pulmonary gas exchange, gas transport, peripheral gas exchange.
4. breathing, pulmonary gas exchange, central gas exchange, peripheral gas exchange.
3. Inhaling
1. occurs when the diaphragm contracts.
2. occurs when the diaphragm relaxes.
3. is the exchange of gas between blood cells and the lungs.
4. is when oxygen in the air is drawn into the body and carbon dioxide is released from the body.
4. Respiration begins with
1. gas transport between the mouth and the atmosphere.
2. ventilation, the process of moving air in and out of the lungs.
3. ventilation between the lungs and the blood.
4. gas exchange between the lungs and the blood.
5. Ventilation involves which organs?
1. the larynx, pharynx, and trachea
2. the lungs, larynx, pharynx, and trachea
3. the heart and lungs, larynx, pharynx, and trachea
4. the heart, blood and lungs, larynx, pharynx, and trachea
6. Gas exchange occurs
1. in the lungs, between the blood and the air.
2. in the alveoli of the lungs, between the peripheral capillaries and lung cells.
3. in the alveoli of the lungs, between the peripheral capillaries and body cells.
4. all of the above
7. Emphysema
1. results in less gas can be exchanged in the lungs.
2. is caused by smoking and is irreversible.
3. causes shortness of breath.
4. all of the above
8. Asthma occurs when the
1. some of the alveoli of the lungs fill with fluid so gas exchange cannot occur.
2. air passages of the lungs periodically become too narrow, often with excessive mucus production.
3. walls of the alveoli break down so less gas can be exchanged in the lungs.
4. all of the above

## Lesson 23.2: Vocabulary I

Name___________________ Class______________ Date________

Match the vocabulary word with the proper definition.

Definitions

_____ 1. the voice box

_____ 2. the exchange of gases between the body and the outside air

_____ 3. a long tube that is shared with the digestive system

_____ 4. a disease in which the air passages of the lungs periodically become too narrow

_____ 5. the wind pipe

_____ 6. tiny air sacs in the lungs

_____ 7. the organs in which gas exchange takes place between blood and air

_____ 8. the body system that brings air containing oxygen into the body and releases carbon dioxide into the atmosphere

_____ 9. a disease in which some of the alveoli of the lungs fill with fluid

_____ 10. the metabolic process by which cells obtain energy

_____ 11. the process of moving air in and out of the lungs

_____ 12. a lung disease in which walls of the alveoli break down

Terms

a. alveoli

b. asthma

c. cellular respiration

d. emphysema

e. larynx

f. lungs

g. pharynx

h. pneumonia

i. respiration

j. respiratory system

k. trachea

l. ventilation

## Lesson 23.2: Vocabulary II

Name___________________ Class______________ Date________

Fill in the blank with the appropriate term.

1. Respiration begins with ____________.

2. Gas exchange is needed to provide cells with the ____________ they need for cellular respiration.

3. Tiny air sacs in the lungs are known as ____________.

4. Inhaling is an active movement that results from the contraction of a muscle called the ____________.

5. Asthma is a disease in which the air passages of the ____________ become narrow, often with excessive mucus production.

6. The ____________ is also known as the wind pipe.

7. Emphysema is usually caused by ____________ and is irreversible.

8. The ____________ is also known as the voice box.

9. The ____________ pumps oxygen-rich blood into arteries.

10. ____________ gas exchange is the exchange of gases between inhaled air and the blood.

11. ____________ is a disease in which some of the alveoli of the lungs fill with fluid so gas exchange cannot occur.

12. Oxygen ____________ from the peripheral capillaries into body cells.

## Lesson 23.2: Critical Writing

Name___________________ Class______________ Date________

Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences.

Define respiration, and explain how it differs from cellular respiration.

Feb 23, 2012

Jan 29, 2016