By the company he works for?
Level 4 includes the material that are extremely hazardous to health. Inhalation, skin contact , swallowing , Injection, etc. are required full protection gear so that none of our skin surface is exposed because these main routes of entry.
There are different ways a person can come into the contact with hazardous chemicals , which is known as expose pathways. And all these are the basic exposure pathways- inhalation, ingestion and skin contact.
There are four levels or the category of toxicity.Toxicity is define as the concentration or the amount of a particular agent that reaches a target organism, system or population in a specific frequency for a fixed duration.
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Something that causes stress is known as an-----
stressor
Systemic circulation provides the functional blood supply to all body tissue. It carries oxygen and nutrients to the cells and picks up carbon dioxide and waste products. Systemic circulation carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body. From the tissue capillaries, the deoxygenated blood returns through a system of veins to the right atrium of the heart.
