Which step is a part of internal respiration?

oxygen rich blood is taken up by the tissues.
air is inhaled through the nostrils.
air is exhaled through the nostrils.
gaseous exchange of oxygen and carbon dioxide occurs at the alveoli.

Gaseous exchange of oxygen and carbon dioxide occurs at the alveoli.

Explanation:

Internal breathing is a process where the body's cells use oxygen and release carbon dioxide, this process is known as systemic circulation or large circulation, arterial blood leaves the left ventricle of the heart through the aorta, this artery branches carrying blood through the whole body. According to this we can state that during internal respiration the gas exchange of oxygen and carbon dioxide occurs in the alveoli.

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