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B
Brain of mammals
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C
Lungs of mammals
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D
Testes of mammals
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Solution
The correct option is C Heart of mammals The myocardium is found in the heart of mammals. It is a muscle found in the heart. It is a muscular layer which is present between the outer epicardium layer and the inner endocardium layer. It is an involuntary and striated cardiac muscle. Its contraction and relaxation pump the blood to the heart. It supplies the nutrients and removes waste products from the cardiac tissues.