Respiratory System Quiz

What is the primary function of the respiratory system in the human body?

• Pumping blood

• Digesting food

• Exchanging gases

• Producing hormones

During inhalation, which muscle contracts and moves downward to increase the volume of the thoracic cavity?

• Rectus abdominis

• Biceps brachii

• Diaphragm

• Pectoralis major

Where does the exchange of oxygen and carbon dioxide occur in the respiratory system?

• Trachea

• Alveoli

• Bronchi

• Pharynx

What is the purpose of the mucus and cilia in the respiratory system?

• Filter and humidify incoming air

• Produce hormones

• Facilitate blood circulation

• Digest nutrients

Which gas is primarily responsible for stimulating the urge to breathe?

• Nitrogen

• Oxygen

• Carbon dioxide

• Hydrogen

Which of the following statements about exhalation is true?

• It is an active process requiring energy.

• The diaphragm contracts, causing an increase in thoracic cavity volume.

• It is a passive process driven by the relaxation of muscles.

• Oxygen is expelled from the lungs.

What is the main function of the bronchi in the respiratory system?

• Gas exchange

• Filtration of air

• Conduction of air to the lungs

• Production of mucus

Which respiratory disorder is characterized by inflammation and narrowing of the airways, leading to difficulty in breathing?

• Asthma

• Pneumonia

• Bronchitis

• Emphysema