Tourists are eagerly awaiting the Changing of the Guard at Buckingham Palace in

Question

Tourists are eagerly awaiting the Changing of the Guard at Buckingham Palace in London. It is a very warm day in July, however, and before the ceremony begins, one of the guards faints and falls over. What might have caused the guard to faint? Check all that apply. Check All That Apply Prolonged standing had caused blood to pool in hits lower extremities. The volume of blood in arteries returning to his heart had decreased. His cardiac output had decreased, sending less blood to the brain. He had lost water from sweating, decreasing his blood volume. The valves in his carotid were not able to push the blood up to his brain.

Explanation / Answer

Fainting usually occurs due to lack of blood flow in the brain, so the third and last reasons are applicable i.e his cardiac output had decreased sending less blood to the brain and the valves in his carotid arteries wer not able to push blood to the brain.

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