which of the following summarizes the function of the respiratory system?

1) transport oxygen to cells and wastes away from ells.
2)to protect the organs in the chest cavity.
3)to move oxygen from the air into the body and carbon dioxide from the body into the air
4) to provide a barrier between the body and the environment.

I think #3. Can you check for me.
Many thanks for your help.

Yes, 3 is correct.

I agree

Of course! I can definitely help you verify which option summarizes the function of the respiratory system.

To do so, let's analyze the options you provided:

1) Transport oxygen to cells and wastes away from cells: This option suggests that the respiratory system is responsible for delivering oxygen to cells and removing waste. While the respiratory system plays a role in the transport of oxygen, it is not responsible for removing waste. This option does not fully capture the entire function of the respiratory system.

2) To protect the organs in the chest cavity: This option suggests that the primary function of the respiratory system is to protect the organs in the chest cavity. While the respiratory system does occupy the chest cavity and indirectly offers some protection, this statement does not encompass the primary function of the respiratory system.

3) To move oxygen from the air into the body and carbon dioxide from the body into the air: This option accurately summarizes the primary function of the respiratory system. The lungs help inhale oxygen from the outside environment and release carbon dioxide as a waste product during exhalation.

4) To provide a barrier between the body and the environment: This option suggests that the primary function of the respiratory system is to create a barrier between the body and the environment. Although the respiratory system does form a barrier between the internal and external environment, this option does not fully capture the primary function of the system.

Based on the analysis, option #3, "to move oxygen from the air into the body and carbon dioxide from the body into the air," correctly summarizes the function of the respiratory system. It highlights the primary role of the respiratory system in gas exchange.