The answer is C. Appearing to be calm and relaxed
Answer:
Heart- Hollow, muscular organ that pumps blood throughout the
body.
Arteries- Blood vessel that carries oxygen-rich blood away from the
heart and to the body parts.
Capillaries- Small blood vessels where materials are exchanged
between the blood and the body's cells (oxygen & carbon
dioxide)
Veins- arries oxygen-poor blood (w/carbon dioxide) back to the
heart (to be pumped out to the lungs)
Explanation:
A security guard. He has to be alert and watchful during all his shift at work
