The term 'heart part' refers to the various components of the human heart. The AURICLE, also known as the atrial appendage, is a 7-letter word and is a small, ear-shaped appendage of the ATRIUM of the heart. A VALVE is a 5-letter word and is a structure that regulates the flow of blood between two chambers of the heart. The COCKLE is a 6-letter word and is a small, curved muscle located in the wall of the left ATRIUM of the heart. The ATRIUM is a 6-letter word and is one of the two upper chambers of the heart. The AORTA is a 5-letter word and is the largest artery in the body, carrying oxygenated blood away from the heart. The right ventricle is a 14-letter word and is one of the four chambers of the heart, responsible for pumping oxygen-depleted blood to the lungs.