Science year 8_1.1 The human respiratory system

Which organ is the first point where air enters the body?

• Larynx

• Trachea

• Nose or mouth

• Alveoli

What is the main function of the respiratory system?

• Provide energy for cells

• Deliver oxygen to the blood and remove CO₂ from the body

• Transport blood

• Digest food

What is the most common type of respiration in human cells?

• Anaerobic respiration

• Aerobic respiration

• Photosynthesis

• External respiration

What are the waste products of aerobic respiration?

• Water

• Heat

• Carbon dioxide

• Oxygen

Which of the following options shows the correct order of the structures that air passes through in the lungs?

• Nose → trachea → alveoli → bronchi → bronchioles

• Nose → trachea → bronchi → bronchioles → alveoli

• Mouth → bronchi → trachea → alveoli

• Mouth → larynx → trachea → stomach

What is another name for the trachea?

• Larynx

• Air tube

• Breathing tube

• Respiratory tract

Which structure has cartilage rings to prevent collapse during breathing?

• Alveoli

• Bronchioles

• Trachea

• Larynx

What is the function of the alveoli (air sacs)?

• Warm the air

• Site of gas exchange between air and blood

• Produce blood

• Trap dust

Which part of the respiratory system contains the muscle bands that produce sound when they vibrate?

• Bronchi

• Larynx

• Lungs

• Nose

Which structure branches from the trachea to lead air into each lung?

• A. Larynx

• B. Alveoli

• C. Bronchi

• D. Bronchioles