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Cardiovascular System

Cardiac Cycle – Events and Sound of Heartbeat

The cardiac cycle refers to the sequence of events that occur during one heartbeat. The contraction phase of a cardiac cycle is known as systole (sis ‘-to-le); the relaxation phase is called diastole (di ‘-as-to-le). During diastole the muscles of the heart relaxes and refills the blood

Variations in the Coronary Arteries/ Coronary Dominance

The origin, course, and distribution of the posterior interventricular artery are variable. In right coronary dominance, the posterior interventricular artery is a branch of the right coronary artery. It’s seen in 90% of the individuals. In left coronary dominance, the posterior interventricular artery originates from circumflex branch

Autonomic Regulation- Neural And Hormonal Regulation of The Heart

Heart rate regulation is primarily under the control of the cardiac control center located within the medulla oblongata of the brain. It receives sensory information about the level of blood pressure from baroreceptors located in the aortic arch and the carotid sinuses of the internal carotid arteries.

Pain and Reflex Pathways of The Heart

Pain Pathways The sensations of pain arising because of the ischemia of the heart go through the sympathetic fibres to reach the upper 5 thoracic spinal segments (T1-T5) via cervical andthoracic sympathetic ganglia and follow the usual somatosensory pathway to the central nervous system. The pain fibres

Blood Vessel Histology

Blood vessels are the part of circulatory system which functions to transfer blood all through the body. Blood vessels can be classified as arteries, capillaries and veins. Capillaries is 60,000 miles long. That is long enough to go around the world more than twice. All the blood

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