Respiratory System Quiz

What percentage of oxygen is transported bound to hemoglobin?

• 2%

• 20%

• 98%

• 70%

Where is the majority of oxygen transported in the blood?

• Dissolved in plasma

• Bound to hemoglobin in red blood cells

• As bicarbonate ions

• As carbaminohemoglobin

What is the name of the molecule formed when oxygen binds to hemoglobin?

• Carbaminohemoglobin

• Carboxyhemoglobin

• Oxyhemoglobin

• Deoxyhemoglobin

What is the primary method of carbon dioxide transport in the blood?

• Dissolved in plasma

• Bound to hemoglobin

• As bicarbonate ions

• As carbonic acid

What percentage of carbon dioxide is transported as carbaminohemoglobin?

• 10%

• 20%

• 70%

• 98%

What enzyme facilitates the conversion of carbon dioxide to bicarbonate ions?

• Hemoglobin

• Carbonic anhydrase

• Catalase

• Amylase

What is the primary regulator of respiration?

• Oxygen levels

• Nitrogen levels

• Carbon dioxide levels

• Blood pressure

How does high carbon dioxide affect respiration?

• Decreases hydrogen ion concentration

• Stimulates the medulla oblongata to increase ventilation

• Inhibits chemoreceptors

• Causes apnea

Where are the central chemoreceptors that monitor carbon dioxide levels located?

• Carotid arteries

• Aortic arch

• Medulla oblongata

• Pons

What is the function of surfactant?

• Increase surface tension in alveoli

• Reduce surface tension in alveoli, preventing collapse

• Facilitate gas exchange

• Trap and remove debris