Question

lo 4.2. what is the function of the respiratory system? breathing in oxygen and exhaling carbon dioxide. filtering and eliminating waste from the blood pumping blood through the body. producing and circulating blood throughout the body transporting oxygen to the body cells and removing waste products

Explanation:

The respiratory system's main function is gas exchange. It takes in oxygen (breathing in) which is needed by cells for cellular respiration and expels carbon dioxide (breathing out), a waste product of cellular respiration.

• Filtering and eliminating waste from the blood is mainly the function of the excretory system (like the kidneys).
• Pumping blood through the body is the heart's (cardiovascular system) function.
• Producing and circulating blood is related to bone marrow (for production) and the cardiovascular system (for circulation).
• Transporting oxygen to body cells and removing waste products is a combined function of the respiratory and cardiovascular systems, but the direct act of taking in oxygen and expelling carbon dioxide (breathing in oxygen and exhaling carbon dioxide) is the most direct function of the respiratory system.

Answer:

Breathing in oxygen and exhaling carbon dioxide.