Final answer:
The lower tip of the heart is the apex, and the valve between the right auricle and ventricle is the tricuspid valve, consisting of three parts connected by chordae tendineae.
Explanation:
The lower tip of the heart is called the apex. The valve between the right auricle and the right ventricle is known as the tricuspid valve. It consists of three parts and is connected by chordae tendineae to prevent backflow of blood.
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