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The Respiratory System: Alveoli and Capillaries

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The Respiratory System: Alveoli and Capillaries

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Questions and Answers

What is the purpose of the diaphragm and muscles between your ribs in breathing?

To transport nutrients to the alveoli

To move air in and out of the lungs (correct)

To filter oxygen from the air

To pump blood to the lungs

Why do most organs sink in water but lungs float?

Because lungs are denser than other organs

Because lungs have a lower surface area

Because lungs are lighter due to air present in alveoli (correct)

Because lungs contain more carbon dioxide

Where does gas exchange between air and blood take place, according to the text?

In the capillaries around the heart

In the trachea

In the bronchi

In the alveoli (correct)

Which blood vessels should be colored blue on diagrams, according to the text?

Vessels that carry blood to the lungs Signup and view all the answers

Why does breathed-out air have less oxygen and more carbon dioxide than breathed-in air?

Gas exchange in the lungs changes the composition of air. Signup and view all the answers

What is the primary function of red blood cells in relation to the alveoli?

To assist in gas exchange Signup and view all the answers

What is the purpose of renewing the air in the lungs through breathing?

To keep the oxygen concentration high in the alveoli. Signup and view all the answers

Why do cells all over the body use oxygen during aerobic respiration?

To release energy from food molecules. Signup and view all the answers

How did Tom Sietas save oxygen by keeping very still?

By reducing his use of energy and cutting respiration to a minimum. Signup and view all the answers

What do muscle cells primarily use energy from respiration for?

To keep themselves alive and warm. Signup and view all the answers

Why is it important for gas exchange to occur as fast as possible between the alveoli and red blood cells?

To maximize oxygen concentration in red blood cells. Signup and view all the answers

What is the main reason Tom Sietas filled his lungs with pure oxygen before setting the breath-holding record?

To increase the amount of oxygen in his blood Signup and view all the answers

Why did Tom Sietas keep totally still once he was in the water?

To conserve oxygen in his blood Signup and view all the answers

How did the cold water contribute to Tom Sietas' ability to hold his breath for a long time?

Slowed down his heart rate Signup and view all the answers

Why does a lung full of pure oxygen supply more oxygen than a lung full of air?

Pure oxygen contains a higher concentration of oxygen molecules Signup and view all the answers

What effect did sitting still have on Tom Sietas' respiratory rate?

Slowed down his breathing rate Signup and view all the answers

Why did Tom Sietas avoid trying to break breath-holding records at home?

Due to potential risks related to extended breath-holding Signup and view all the answers