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The human circulatory system consists of blood, heart , blood vessels, and lymph. The human circulatory system circulates blood through two loops (double circulation) – One for oxygenated blood, another for deoxygenated blood. The human heart consists of four chambers – two ventricles and two auricles. The human circulatory system possesses a body-wide network of blood vessels. These comprise arteries, veins, and capillaries. The primary function of blood vessels is to transport ... The heart is a muscular organ composed of specialized muscles called cardiac muscles. The main function of the human heart is to pump blood to various parts of the body. There are several internal factors which enable the human heart to regulate its activities on its own, but there are some external influences as well which regulate cardiac activity. These factors include an autonomic nervous system, chemicals like hormones, ions etc. Let us start our discussion with the cardiac cycle. The human heart is a muscular organ that is about the size of a fist. It pumps blood through a set of connections between arteries and veins, known as the cardiovascular system. It involves systemic and pulmonary circulation. Table of Contents Meaning Diagram Physiology Phases Duration Cardiac Cycle Definition “Cardiac cycle refers to the sequence of events that take place when the heart beats.” The human heart is the most crucial organ of the human body. It pumps blood from the heart to different parts of the body and back to the heart . The most common heart attack symptoms or warning signs are chest pain, breathlessness, nausea, sweating etc.
