Considering cardiovascular circulation which happens first 1-From the left atrium, the blood flows through the biscupid, or mitral valve into the left ventricle.
2- From the right ventricle, the blood flows through the pulmonic valve into the pulmonary artery.

Cardiovascular circulation happen in the following order;

Explanation:

The cardiovascular system functions by maintaining blood flow in all parts of the body. The cardiovascular system has three main components which are the heart, the blood vessels and the blood.

With cardiovascular circulation, the the right atrium pumps blood into the right ventricle and then the right ventricle pumps blood into the pulmonic valve and into the pulmonary artery. After which the blood flows to the lungs.

From the lungs, blood flows into the left atrium after which it flows into the left ventricle. The left ventricle goes on to pump the blood into the aorta and then the blood gets circulated to other parts of the body via the arteries

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    however, coronary heart disease , or chd, is actually a result of coronary artery disease, or cad, said edward a. fisher, m.d., ph.d., m.p.h., an american heart association volunteer who is the leon h. charney professor of cardiovascular medicine and also of the marc and ruti bell vascular biology and disease program at the nyu school of medicine.

  with coronary artery disease, plaque first grows within the walls of the coronary arteries until the blood flow to the heart’s muscle is limited. view an illustration of coronary arteries. this is also called ischemia. it may be chronic, narrowing of the coronary artery over time and limiting of the blood supply to part of the muscle. or it can be acute, resulting from a sudden rupture of a plaque and formation of a thrombus or blood clot.

    the traditional risk factors for coronary artery disease are high ldl cholesterol, low hdl cholesterol, high blood pressure, family history, diabetes, smoking, being post-menopausal for women and being older than 45 for men, according to fisher. obesity may also be a risk factor.

    “coronary artery disease begins in childhood, so that by the teenage years, there is evidence that plaques that will stay with us for life are formed in most people,” said fisher, who is former editor of the american heart association journal, atvb. “preventive measures instituted early are thought to have greater lifetime benefits. healthy lifestyles will delay the progression of cad, and there is hope that cad can be regressed before it causes chd.”

  living a healthy lifestyle that incorporates good nutrition, weight management and getting plenty of physical activity can play a big role in avoiding cad.

    “coronary artery disease is preventable,” agreed johnny lee, m.d., president of new york heart associates, and an american heart association volunteer. “typical warning signs are chest pain, shortness of breath, palpitations and even fatigue.” if you feel any of these symptoms, don’t delay — call 9-1-1.