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What is the primary function of the respiratory and circulatory systems in animals?

• To produce energy and store nutrients.

• To absorb carbon dioxide and release oxygen.

• To take in oxygen and remove carbon dioxide.

• To regulate body temperature and maintain hydration.

Which type of animal can obtain oxygen through simple diffusion across a moist membrane without needing lungs?

• Mammals

• Birds

• Arthropods

• Fish

Why do larger, warm-blooded animals like mammals and birds require lungs for respiration instead of relying on simple diffusion?

• Simple diffusion is too slow for their metabolic needs.

• Their skin is too thick for gas exchange.

• They need to regulate body temperature and require a lot of oxygen to burn calories.

• Lungs provide a moist environment for gas exchange.

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What key feature of human lungs allows them to absorb a large amount of oxygen efficiently?

• Their ability to expand and contract rapidly.

• The presence of a large surface area of oxygen-dissolving membranes.

• Their location deep within the body.

• The strong muscular walls of the bronchi.

Where does the primary exchange of oxygen and carbon dioxide occur within the human respiratory system?

• In the trachea.

• In the bronchi.

• In the bronchioles.

• In the alveoli.