Which substances are produced during respiration?

The role of the respiratory system is to bring what substance into the body?

What happens to cause air to be exhaled from the lungs?

Which chemical in tobacco smoke is an addictive drug?

A tumor that develops in the lungs may be a sign of

Which organ of the excretory system stores urine until the body is ready to eliminate it?

Under normal conditions, which of the following substances is found in urine?

Which excretory organ eliminates water and some chemical wastes in perspiration?

How can smoking lead to emphysema?

Which parts of the respiratory system divide into smaller and smaller tubes in a pattern that resembles the branches of a tree?

Hairlike structures that line the nasal cavities and trachea are called

The vocal cords stretch across the opening of the

Organs of excretion that maintain homeostasis include the kidneys, lungs, skin, and

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