Respiratory System 1

How did the earliest, simplest forms of life, like bacteria, obtain the oxygen they needed?

• Through a complex circulatory system.

• By actively pumping water through specialized organs.

• Directly from the water through their membranes via diffusion.

• By consuming other organisms that had already processed oxygen.

What environmental changes led to the evolution of lungs in lobe-finned fish?

• Increased predation in deep ocean waters.

• Earth getting warmer, seas shallower, and lower oxygen concentrations in surface water.

• A sudden increase in atmospheric carbon dioxide levels.

• The emergence of new land-based food sources.

Why is simple diffusion alone insufficient for oxygen transport in large, complex organisms like humans?

• Simple diffusion requires too much energy.

• The concentration gradient is not strong enough in large organisms.

• Oxygen molecules would take too long to diffuse across the necessary distances, leading to cell death.

• Large organisms have too many cells, making diffusion impractical.

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How do the respiratory and circulatory systems work together to efficiently deliver oxygen throughout the body?

• The respiratory system uses bulk flow to move oxygen into the lungs, and the circulatory system uses simple diffusion to distribute it to cells.

• Both systems rely solely on simple diffusion for oxygen transport.

• The circulatory system uses bulk flow to transport oxygen-rich blood, and simple diffusion moves oxygen from lung cells into the blood.

• The respiratory system actively transports oxygen, while the circulatory system passively carries it.

What happens to the diaphragm and rib cage when you breathe in?

• The diaphragm relaxes and the ribs move down.

• The diaphragm contracts and flattens, and the ribs lift up and out.

• The diaphragm contracts and pushes up, and the ribs move down.

• The diaphragm relaxes and flattens, and the ribs lift up and out.

Besides filtering particles, what is another crucial function of the nose and sinuses in breathing?

• They produce hormones that regulate breathing rate.

• They cool and dry incoming air to protect lung cells.

• They warm and moisten incoming air to prevent lung cells from drying out.

• They act as a secondary site for gas exchange.

What is the primary role of the epiglottis during swallowing?

• To help filter air before it reaches the lungs.

• To produce vocal sounds.

• To cover the larynx and direct food/liquid into the esophagus.

• To expand the trachea to allow more air in.

Where does the primary gas exchange (oxygen into blood, carbon dioxide out of blood) occur in the lungs?

• In the bronchi.

• In the trachea.

• In the alveoli.

• In the nasal cavity.