Biology; Chemistry; Physics: Post your doubts here!

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Biology olevel question:
The Cerebellum lies at the back of the brain underneath the Cerebrum and controls the muscle contraction but does not initiate it.The Medulla is the lower half half of the brain stem ,also located underneath the Cerebrum and contains the cardiac center and respiratory center.The heart is also a muscle so the Cerebellum must be responsible for its contraction as well ,but then, what is the role of the Medulla here? Is the role of the Medulla and Cerebellum related? If so,then how? How do they coordinate in the contraction of the heart?
 
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What is the Atheroma (the yellow mass building up and causing a blockage in the artery) made up of? What are the main reasons for its formation ?
 
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How much is the factor of genetics responsible for the development of coronary heart disease?Why is a person with a family history of the disease ,more likely to develop it themselves?
 
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