How many breaths does an average person take per minute?

• 2-4

• 12-20

• 20-30

• 30-40

Which structure serves as the "door" at the top of the larynx?

• Pharynx

• Epiglottis

• Trachea

• Bronchi

How many oxygen molecules can a single hemoglobin molecule carry?

• 1

• 2

• 3

• 4

Which respiratory structure is known as the voice box?

• Pharynx

• larynx

• Trachea

• Brochi

What is the primary function of the nasal cavity?

• Production of blood cells

• Production of blood cells

• Warming and moistening of air

• Production of mucus only

What supports the structure of the trachea?

• Muscle tissue

• Cartilage rings

• Elastic fibers

• Bone tissue

What happens to the diaphragm during inspiration?

• It relaxes

• It contracts

• It remains stationary

• It dissolves

Which sequence correctly describes the path of air through the respiratory system?

• Nose → Pharynx → Trachea → Bronchi → Alveoli

• Nose → Trachea → Pharynx → Bronchi → Alveoli

• Nose → Bronchi → Trachea → Pharynx → Alveoli

• Nose → Alveoli → Bronchi → Trachea → Pharynx

What is the primary function of the respiratory system?

• To regulate body temperature

• To produce hormones

• To deliver oxygen and remove CO2 from the body

• To filter blood

Where does external respiration occur?

• Heart

• Lungs

• Tissue cells

• Blood vessels