Year 11 Gas Exchange

Which of these correctly describes the make up of exhaled air?

• 78% Oxygen, 10% Carbon dioxide

• Approximately 78% nitrogen, 21% oxygen, 0.04% carbon dioxide, and small amounts of other gases like water vapor.

• Approximately 78% nitrogen, 30% oxygen, 20% carbon dioxide

• Approximately 78% nitrogen, 16% oxygen, 5% carbon dioxide, and small amounts of other gases like water vapor.

What is the site of gas exchange?

• alveoli

• bronchus

• nose

• trachea

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

Letter D is pointing to which Respiratory organ?

• Alveoli
• Diaphragm
• Lung
• Bronchi

What is the main function of the respiratory system?

• to provide oxygen and remove carbon dioxide from the body

• to bring oxygen to the body

• to break down food and absorb nutrients

• to remove oxygen from the body and deliver carbon dioxide

Recall which of the following causes inhalation.

• The diaphragm contracting

• The diaphragm relaxing

• The intercostal muscles contracting

• The thorax getting smaller

The yellow structures on the right side of this picture represent ________.

• diaphragm

• pharynx

• alveoli

• trachea

Place the steps in the correct place:

Groups:

(a) Inhalation

,

(b) Exhalation

• external intercostals relax

• air is drawn into the lungs down a pressure gradient

• internal intercostals contract

• abdominal muscles relax

• rib cage expands in size

• air is pushed out of the lungs down a pressure gradient

• atmospheric pressure greater than that in the lungs

• diaphragm contracts

• diaphragm relaxes

• pressure in the lungs increases

• volume of the thoracic cavity decreases

• external intercostals contract

• pressure in the lungs decreases

• pressure in lungs greater than in the atmosphere

• internal intercostals relax

• abdominal muscles contract

• rib cage decreases in size

• oxygen is absorbed into the bloodstream

• volume of the thoracic cavity increases

Label the parts of the respiratory system shown:

a

b

c

d

e

f

g

h

abdominal muscles

Lung

diaphragm

bronchus

nasal passage

epiglottis

bronchioles

trachea

Match the following:

• One Cell Thick

• Bronchi

• C-Shaped Cartilage

• Trachea

• Cartilage present in blocks

• Bronchioles

• Little/no cartilage present

• Alveoli