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Which of the following describes external respiration?

Oxygen diffuses out of the blood into the tissue cells.

Carbon dioxide diffuses from the tissue cells into the blood.

There is an exchange of gases between the lung alveoli and the blood capillaries.

All of the above

An electric shock can result in anything from a slight tingling sensation to immediate cardiac arrest. the severity depends on the amount of current flowing through the body, the current's path through the body, the length of time the body remains in the circuit, and the current's