Both external respiration and internal respiration take place in capillaries.

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Capillaries are the smallest blood vessels that allow for the exchange of gases, nutrients, and waste products between blood and surrounding tissues. External respiration occurs in capillaries surrounding the alveoli in the lungs, where oxygen is picked up by red blood cells and carbon dioxide is released into the lungs. Internal respiration takes place in capillaries throughout the body's tissues, where oxygen is released from red blood cells and carbon dioxide is picked up for transport back to the lungs. Therefore, both external and internal respiration occur in capillaries.

Both External Respiration and Internal Respiration Take Place in Capillaries