Human Respiratory System

Breathing is the process of inhaling and ... air by the lung

Gas come in and out from lung

• Carbon dioxide

• Oxygen

• Nitrogen

• Hydrogen

Muscle involve in breathing mechanism

When you inhale

• Intercostal muscles contract

• Rib cage move downward and inward

• Thoracic cavity bigger

• Air pressure in thoracic cavity decrease

When air breath out

• Rib cage move downward

• Rib cage move inward

• Diaphragm relax

• Diaphragm contract

Experiment in the diagram is to

• To determine the percentage of oxygen in exhale air

• To determine the percentage of oxygen in inhale air

• To determine the concentration of oxygen in exhale air

• To determine the concentration of carbon dioxide in exhale air

What happen to the lime water at the end of the experiment on the diagram

• Lime water at inhale air is more cloudy

• Lime water at exhale air is more cloudy

How many percentage of oxygen in inhale air

• 1%

• 4%

• 16%

• 21%

Y shape tube in the model represent

• Trachea

• Bronchus

• Rib cage

• Diaphragm

Name the parts of human respiratory system in the diagram