We wake up every day, go on about our lives, fall asleep, rinse, repeat, wash, or at least until we don’t. Most of us pay little attention to what exactly it is that keeps us upright and moving, or the organs that are working in tandem inside our bodies to contribute to our status of "Alive".
However, the students pursuing medical or allied health sciences have to study human physiology quite extensively, of which the cardiovascular system is a vital component. The medicine and nursing scholars cannot make do with just watching the scribbling and bleeping of some cryptic machines on the television screen either – it’s the real deal here, with all its rewards and toils. Classes, assignments, exams, quiz, you name it, and they have it. But what, when burning the midnight oil all by yourself, just doesn’t cut it anymore? When all it does is lead you along an ever-spiraling path of more confusions and worries? Yes, that’s when you seek expert Cardiovascular physiology Homework Help from experienced professionals, and what you seek, you get here with us at Sample Assignments!
Internal view of the heart (pearsonhighered)
The heart is a fist-sized organ weighing around 0.8 pounds that pumps and circulates blood through the body using an elaborate system of muscles, chambers, tissues, valves, and nodes. It has its own network of arteries, veins, capillaries, venules, and arterioles for oxygenating and distributing blood all over the body. The heart muscle, commonly known as the myocardium, or the cardiac muscle, works on electric impulses that make the myocardium layer contract and relax, prompting a sequence of events that form the cardiac cycle.
It is encompassed within the mediastinal nook of the thorax flanked by the lungs and the second and fifth intercostal space.
The heart cavity has 4 chambers – 2 atria and 2 ventricles, differentiated by the cardiac valves. The four Cardiac valves, known as the Tricuspid Valve, the Pulmonary Valve, the Mitral Valve, and the Aortic Valve, also regulate the flow and channel of blood. A sac known as the pericardium encases and protects the heart from expanding too far by firmly securing it inside the thorax. The pericardium, in turn, is anchored to the diaphragm and the interior surface of the sternum and has the following components:
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The cardiac muscle can undergo depolarization, i.e., the cardiac tissue cells get excited variably, leading to their contraction. In the heart, the cardiac impulse is generated through a change in the electrical charge. The frequency is synchronized by its own conduction system, which starts with a series of excitations in the sinoatrial node (SAN) located in the right atrium. Also known as the heart’s natural pacemaker, a properly functional SAN sets the sinus rhythm that we hear as the “heartbeats” and instigates impulses that set the myocardium into motion, stimulating cardiac contraction. The cardiac impulse then shifts from the SAN into the atria, causing it to contract and the impulse is transmitted to another set of specialized cells, the atrioventricular node (AVN).
All four chambers of the heart contract and expand following this pattern. The contraction is known as Systole, and the expansion is called Diastole. The Right and Left Atrium sync with the atrial systolic and diastolic phases, and the Right and Left Ventrium work with the ventricular systolic and diastolic phases.
One complete cycle of these two processes is known as the Cardiac Cycle.
Mapping the Cardiac Cycle is one of the most reliable ways of knowing any discrepancies in the normal functioning of a heart.
Symbols in an EKG graph & their significance (jbpub)
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