Question

practice it
lo 4.2. what is the trachea?
a tube that connects the kidneys to the mouth and nose.
a tube that connects the stomach to the mouth and nose.
a tube that connects the brain to the mouth and nose.
a tube that connects the lungs to the mouth and nose.
a tube that connects the heart to the mouth and nose.

Explanation:

The trachea, also known as the windpipe, is part of the respiratory system. Its main function is to facilitate the passage of air. The respiratory system's purpose is to take in oxygen (from the mouth and nose) and deliver it to the lungs for gas - exchange (where oxygen enters the bloodstream and carbon dioxide is expelled). So, the trachea connects the lungs to the mouth and nose.

• The kidneys are part of the excretory system (related to filtering blood and producing urine), so the trachea does not connect them to the mouth and nose.
• The stomach is part of the digestive system (involved in food digestion), so the trachea is not connected to it from the mouth and nose.
• The brain is part of the nervous system (coordinating body activities), and the trachea has no such connection.
• The heart is part of the circulatory system (pumping blood), and the trachea is not its connecting tube to the mouth and nose.

Answer:

A tube that connects the lungs to the mouth and nose.