A. Moderate. If he can carry on a conversation without running out of breath then he is probably not a stranger to that type of workout and is use to much harder tasks.
The correct answer is:
Oxygenated blood to the body
Explanation:
An artery meaning 'windpipe, the artery is a blood vessel that carries blood aside from the heart to all parts of the body (tissues, lungs, etc). Most arteries transport oxygenated blood; the two differences are the pulmonary and the umbilical arteries, which transport deoxygenated blood to the organs that oxygenate it. The adequate arterial blood volume is that extracellular fluid which stretches the arterial system.
Check if the person is breathing or not is the answer
