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Motivation research overwhelmingly concludes that teachers should encourage
Aortic Semilunar Valve
A valve in the heart situated between the left ventricle and the aorta that prevents blood from flowing back into the heart.
Pericardium
The pericardium is the fibrous sac that encloses the heart, providing it protection and the lubrication needed for its movements.
Lubrication
The process or technique of using a lubricant to reduce friction and wear between two surfaces in contact.
Sphincter Muscles
Ring-like muscles that constrict or close a bodily passage or orifice to control the passage of substances.
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