Respiratory System Quiz

What is external respiration?

• The process of gas exchange between the lungs and the blood in the pulmonary capillaries.

• The process of cellular respiration within mitochondria.

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

• The process of breathing in and out.

Which muscle is primarily involved in breathing?

• Intercostal muscles

• Diaphragm

• Scalene muscles

• Sternocleidomastoid

What happens to lung perfusion during exercise?

• It decreases

• It remains constant

• It increases

• It stops

What is the main function of hemoglobin in red blood cells during gas exchange?

• To transport carbon dioxide

• To bind with oxygen

• To dissolve in plasma

• To convert oxygen to water

What is the primary role of the alveoli in the lungs?

• To filter air

• To exchange gases

• To produce mucus

• To humidify air

What is the primary component of air in the alveoli?

• Nitrogen

• Oxygen

• Carbon dioxide

• Argon

What is the primary direction of oxygen movement during gas exchange?

• From blood to alveoli

• From alveoli to blood

• From trachea to alveoli

• From bronchioles to alveoli

How many iron-containing heme groups does hemoglobin have?

• Two

• Four

• Six

• Eight

What happens to hemoglobin's affinity for oxygen when CO2 levels are high and pH drops?

• Affinity increases

• Affinity decreases

• Affinity remains unchanged

• Affinity fluctuates

What percentage of oxygen in the blood is carried by hemoglobin?

• 70%

• 98%

• 50%

• 20%