Gas Exchange

The intercostal muscles are contracting and the ribs move upwards

• INHALATION

• EXHALATION

The diaphragm contracts and becomes flat

• INHALATION

• EXHALATION

Thoracic cavity (chest cavity) volume decreases and the air is forced out of the lungs

• INHALATION

• EXHALATION

What is the primary purpose of inhalation and exhalation in the respiratory system?

• To cool down the body

• To transport nutrients to cells

• To exchange oxygen and carbon dioxide

• To regulate blood sugar levels

During inhalation, which muscle contracts to increase the size of the chest cavity?

• Biceps

• Diaphragm

• Quadriceps

• Hamstrings

Which gas is primarily taken in during inhalation and released during exhalation?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

What happens to the diaphragm during exhalation?

• It contracts and flattens

• It relaxes and moves upward

• It remains unchanged

• It vibrates

Which of the following statements is true about inhalation and exhalation?

• Inhalation brings in carbon dioxide, while exhalation releases oxygen.

• Both inhalation and exhalation are controlled by the heart.

• Inhalation is an active process, while exhalation is passive.

• Exhalation occurs before inhalation in the breathing cycle.

What role do the intercostal muscles play during inhalation and exhalation?

• They control digestion

• They pump blood to the lungs

• They contract to expand and contract the ribcage

• They assist in maintaining body temperature

What part of the body detects the levels of oxygen and carbon dioxide in the blood and regulates breathing accordingly?

• Kidneys

• Lungs

• Liver

• Brainstem