The answer to your question is C.Viral
A gatekeeper is a health care professional, usually a primary care physician or a physician extender, who is the patient's first contact with the health care system and triages the patient's further access to the system.
When used in relation to health insurance, a gatekeeper describes the person in charge of a patient's treatment. Anyone who receives health insurance coverage in the form of a managed care plan, specifically a health maintenance organization (HMO) plan, is assigned a gatekeeper or allowed to choose one.
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Answer:
The heart is made of three layers of tissue. Endocardium, the thin inner lining of the heart chambers that also forms the surface of the valves. Myocardium, the thick middle layer of muscle that allows your heart chambers to contract and relax to pump blood to your body.
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