What is the structure of human heart??

Explanation:

The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline.

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There are four chambers in the human heart. The right and left atrium are the upper two chambers. The right and left ventricles are the lower two chambers. The pulmonary vein transports oxygenated blood from the lungs to the left atrium. The pulmonary arteries carry blood from the right side of the heart to the lungs. A pericardial sac surrounds the heart and is lined by the parietal layers of a serous membrane.

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light-years

magnitude

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: