Anatomy and Physiology II Practice Test

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What is the term for the exchange of gases between blood and tissues?

External respiration
Internal respiration
Cellular respiration
Systemic respiration

The correct answer is: Internal respiration

The exchange of gases between blood and tissues is referred to as internal respiration. During this process, oxygen is delivered from the blood to the tissues, and carbon dioxide produced by cellular metabolism is transferred from the tissues back into the blood. This is a vital function as it ensures that cells receive the oxygen they need for metabolic processes, while also facilitating the removal of carbon dioxide, a waste product of metabolism. In contrast, external respiration describes the exchange of gases between the atmosphere and the blood, primarily occurring in the lungs. Cellular respiration is the metabolic process that takes place within cells, converting biochemical energy from nutrients into adenosine triphosphate (ATP) while producing carbon dioxide and water as byproducts. Systemic respiration is not a commonly used term in physiology and is not specifically associated with the gas exchange process in the body.