The Human Respiratory System

Diagram shows a model of human respiratory system. K represents....

• lung

• rib cage

• diaphragm

• thoracic cavity

Epiglottis is the structure that opens or closes the trachea.

• TRUE

• FALSE

Exchange of gases in the body cells occurs in the bronchioles.

• TRUE

• FALSE

What is X?

• Trachea

• Bronchus

• Bronchiole

• Epiglottis

Which is the correct air passage in the breathing mechanism?

• Nostril, nasal cavity, pharynx, larynx, trachea, bronchus, bronchiole, alveolus

• Nostril, nasal cavity, larynx, pharynx, trachea, bronchus, bronchiole, alveolus

• Nostril, nasal cavity, pharynx, larynx, trachea, bronchiole, bronchus, alveolus

• Nostril, nasal cavity, trachea, larynx, pharynx, bronchus, bronchiole, alveolus

Name structure Y.

• Trachea

• Bronchus

• Bronchiole

• Alveolus

Which of the structures of human respiratory system NOT involve in the air passage in the breathing mechanism?

• Trachea

• Intercostal muscle

• Rib

• Larynx

During inhalation....

• intercostal muscles contract

• air pressure in the thoracic cavity to decrease

• rib cage moves downwards and inwards

• diaphragm muscles relax and curve upwards

• diaphragm muscles contract

During exhalation....

• intercostal muscles contract

• air pressure in the thoracic cavity to decrease

• rib cage moves downwards and inwards

• diaphragm muscles relax and curve upwards

• intercostal muscles relax

"Movements of the rib cage and diaphragm make the thoracic cavity smaller and cause the air pressure in the thoracic cavity to increase"

The situation happens during....

• inhalation

• exhalation

• excretion

• blood circulation