Respiratory system

What is external respiration?

• Exchange of gases between the blood and tissues

• Exchange of gases between the air and blood

• Exchange of gases within the cells

• Exchange of gases between the lungs and the environment

What is internal respiration?

• Exchange of gases between the blood and tissues

• Exchange of gases between the air and blood

• Exchange of gases within the cells

• Exchange of gases between the lungs and the environment

What is gaseous exchange?

• The process of converting gases into liquids in the body.

• The movement of gases from the atmosphere to the lungs.

• The exchange of gases between the lung tissue and the blood or between the blood and the tissues of the body.

• The absorption of gases by the skin.

Where does gas exchange occur in the human body?

• In the bronchi

• In the alveoli

• In the trachea

• In the bronchioles

What is primarily transferred from the blood into the alveoli during gas exchange?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

What does the respiratory system do with carbon dioxide during expiration?

• It absorbs carbon dioxide from the air

• It converts carbon dioxide into oxygen

• It stores carbon dioxide in the lungs

• It excretes carbon dioxide from the body into the air

What happens to the diaphragm during inspiration?

• It relaxes and moves in a cranial direction

• It contracts and becomes dome-shaped

• It contracts, becoming flatter and moving in a caudal direction

• It remains unchanged

What is the role of the external intercostal muscles during inspiration?

• They relax, allowing the ribcage to move inwards

• They contract, lifting the ribcage outwards

• They contract, pulling the ribcage downwards

• They have no role during inspiration

How does the volume change within the thoracic cavity during inspiration?

• The volume decreases

• The volume remains the same

• The volume increases

• The volume fluctuates rapidly

What effect does the negative pressure of the pleural space have during inspiration?

• It decreases, allowing air to be expelled from the lungs

• It increases, drawing air into the lungs

• It remains constant, stabilizing air flow

• It becomes positive, preventing air entry