Why are muscles bundles and not singular?​

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several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.