Understanding Gas Exchange in Humans

What is the main function of the respiratory system?

• To produce glucose

• To provide oxygen and remove carbon dioxide

• To circulate blood

• To digest food

Where does the exchange of gases between the blood and the air occur?

• In the trachea

• In the alveoli

• In the bronchi

• In the diaphragm

What is the process called where cells break down glucose to get energy?

• Photosynthesis

• Cellular respiration

• Fermentation

• Glycolysis

What waste product is produced during cellular respiration?

• Oxygen

• Nitrogen

• Carbon dioxide

• Methane

How many alveoli are there approximately in the human lungs?

• 1 million

• 100 million

• 300 million

• 500 million

What is the natural movement of gas or liquid particles from an area of higher concentration to an area of lower concentration called?

• Osmosis

• Diffusion

• Filtration

• Active transport

What happens to the alveoli when we inhale?

• They contract and release air

• They expand and fill with air

• They dissolve in the bloodstream

• They produce carbon dioxide

Which of the following is a simple sugar that cells break down for energy?

• Sucrose

• Fructose

• Glucose

• Lactose

What carries gases to and from the cells in the body?

• The nervous system

• The digestive system

• The bloodstream

• The lymphatic system

What diffuses from the blood into the alveoli during gas exchange?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen