Describe The Relationship Between Atria And Ventricular Valves
The heart is a hollow muscular organ that lies within the mediasternum, a mass of tissue extending from the sternum down to the vertebral column between the lungs. Structurally, the heart is composed of three layers of tissue; epicardium, myocardium (middle layer) and endocardium (inner layer). The epicardium is a layer of muscle composed of mesothelium and connective tissue sheltering the external surfaces of the heart. This external layer is directly merged with the myocardium internally and is in contact with the serous layer of the pericardium. In some cases, it is viewed as a division of the inner layer of the pericardium, the pericardium being the membrane surrounding and protecting the heart essentially keeping the heart in its right …show more content…
A set of valves are present in the interior structure of the heart to keep fluid from flowing in one direction. The heart has two types of valves that assist in keeping blood from flowing in the correct direction. Valves located between the atria and ventricles are known as atrioventricular valves (or cuspid valves), and the valves located at the bases of the large vessels leaving the ventricles are called semilunar valves (or pulmonary valve for the right side and aortic valve for the left side). Each set of valves carry out their functions so that regurgitation does not occur. For example, when the ventricles contract, atrioventricular calves close to prevent blood from flowing back into the atria. In contrast to this, when the ventricles relax, the semilunar valves close to prevent back flow into the …show more content…
The oxygenated blood passes through the bicuspid valve and into the left ventricle where it will be ejected into the largest artery of the body known as the aorta via the aortic valve. The ejected blood will then be distributed throughout the body using a network of blood vessels. The distribution of blood throughout the body occurs via the four divisions of the aorta; the ascending aorta, the aortic arch, the thoracic aorta and the abdominal aorta. Beyond the aortic valve within the ascending aorta, there ate miniature openings called coronary ostia which arise from the left and right coronary arteries that supply blood to the heart
Northern Pintail: Skeletal System
1436 Words | 6 PagesThe Pintails heart is like a mammals consisting of four chambers, two ventricles and two atria. The left ventricle pumps blood to all major organs in the body and throughout the rest, only excluding the lungs. This causes the left ventricle to be larger and more muscular. The lungs are fed blood from the right ventricle, which is the only the only function of that ventricle. The oxygenated blood coming from the lungs is fully separated from the oxygenated blood coming from other parts of the body.
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747 Words | 3 PagesA bundle branch block anatomy involves the heart, but specifically the electrical nodes of the heart and the chambers of the heart. The electrical nodes of the body act as a pacemaker to help the heart correctly beat. The sinoatrial node (SA node) will send impulses to help the heart to contract. This impulse is sent to the upper chamber of the heart and then passes through the atrioventricular node (AV node). This impulse is sent through a pathway
Explain How The Blood Flows Between The Lungs And The Rest Of The Body
911 Words | 4 PagesHeart, lungs and the Rest of You By: Olivia Abel 1.Explain how the blood flows throughout your lungs, heart and the rest of your body. Heart: Your left and right side of your heart work together to pump blood to and throughout your body which is separated by muscular tissue called the septum. In the right side blood enters through two large vein which are the inferior and superior vena cava, emptying poor oxygen blood from the body to the right reticulum. When the left side enters from the pulmonary veins and empties oxygen rich blood from the lungs into the aorta going throughout the body.
Diastolic Heart Failure
1517 Words | 7 PagesSystolic and Diastolic Heart Failure Heart failure occurs when the heart cannot pump enough blood for the body due to a weakened or damaged heart. The heart 's pumping action moves oxygen-rich blood as it travels from the lungs to the left atrium, then on to the left ventricle, which pumps it to the rest of the body. The left ventricle supplies most of the heart 's pumping power, so it 's larger than the other chambers and essential for normal function. (American Heart Association). In left-sided or left ventricular heart failure, the left side of the heart must work harder to pump the same amount of blood.
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776 Words | 4 PagesThis obstruction increased the systolic pressure of left ventricle and increased end-diastolic pressure with no increasing of stroke
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621 Words | 3 PagesGroup one of antiarrhythmic blocks the sodium channels in the heart which then slows down the electrical conduction of
Essay On Prosthetic Heart Valve
711 Words | 3 PagesBioprosthetic valves used in heart valve replacement generally offer functional properties that are more similar to those of native valves. Implantation of prosthetic cardiac valves to treat hemodynamically significant aortic or mitral valve disease has become increasingly common. Replacement of diseased valves with prosthetic heart valves reduces the morbidity and mortality associated with native valvular disease, but it comes at the expense of risking complications related to the implanted prosthetic device. Blood flowing in and out of the heart must pass through the heart valves. The valves allow the blood to flow through the valves, but prevent the occurrence of backflow.
Analysis Of Paul Cardall's Before My Heart Stops
637 Words | 3 PagesVentricle heart defect may consist of a single ventricle or as for Cardall a double-inlet ventricle defect. A single ventricle heart defect is the most common and the left ventricle heart defect is affects the right ventricular anatomy (Porth & Matfin, 2009). With the tricuspid valve not opening and closing properly is a common cause for the left ventricle defect (Porth & Matfin, 2009). The DILV defect is where the left ventricle has two inlets, the pulmonary and systemic venous return mixes, and finally puts pressures on the right ventricle (Porth & Matfin. 2009). Cardall (2010) defined his DILV as the left and right atria empting into the same
Ecg Lab Report
6972 Words | 28 PagesThe heart is a hollow muscle that is about the size of a fist. In one minute, it pumps about five liters (roughly five quarts) of blood through the body, it is made up of four chambers as shown in Figure 2 .1 Right Atrium (RA), Left Atrium (LA), Right Ventricle (RV), Left Ventricle (LV). An ECG is a diagnosis tool that reported the electrical activity of heart recorded by skin electrode. The morphology and heart rate reflects the cardiac health of human heart beat [16].
Summary: Skeletal Muscles
1789 Words | 8 PagesThe cardiac cycle is the coordination of the filling and exhausting of blood by electrical signals that cause the heart muscles to contract and unwind. The contraction of the heart is directed by a nerve drive that goes from the SA node to AV node to AV group to Purkinje fibers to the myocardium. Amid the cardiac cycle, the heart contracts by means of systole, pushing blood out of the heart, and unwinds through diastole, filling the heart with blood. Cardiomyocytes, or cardiac cells, are striated and are in charge of the pumping of the heart; they are the main muscle cells with intercalated plates. The heart's inner pacemaker controls and times the thumping of the heart by means of electrical signals.
Artificial Heart Valves Research Paper
584 Words | 3 PagesThis is because whenever a fluid flows through a restriction, in this case a valve, a pressure gradient arises over the restriction. The pressure gradient is due to the increased resistance to flow through the valve. The transvalvular pressure gradient of natural heart valves is low because there is little obstruction in the flow, typically less than 16 mmHg. A major specification of artificial heart valves used is that they are non thrombogenic or at least minimally thrombogenic. The endothelium lining of natural heart valves is normally non thrombogenic.
William Harvey's On The Motion On The Heart And Blood In Animals
713 Words | 3 PagesVesalius had observed, by dissection, that there were no pores in the septum of the heart. This meant that direct transfer of blood was not possible. Harvey’s explanation for how blood was transferred from the right ventricle to the left ventricle was that it went through the lungs via the pulmonary arteries and returned through veins to the left auricle, and subsequently to the left ventricle. Once again this description was a simplified explanation of flow in line with his observations and those of Vesalius and
Cardiovascular Response Essay
1583 Words | 7 PagesIn other words, the increase in stroke volume occurs as a result of improved ventricular force of contraction. Heterometric and homeometric control governs myocardial force of contraction. While homeometric control is independent of the myocardial fibres length at the end of diastole, heterometric control depends on this length of myocardial fibres at the diastole end and is mainly influenced by the venous return (Agarwal et al. CC06). The respiratory pump, as well as venoconstriction skeletal muscle pump, influences the rise in venous return during physical activity.
Complete Heartbeat Case Study
242 Words | 1 PagesThis prevents backflow of blood into the atria. The closure of these valves produces the familiar sound of the heartbeat. They last for about 0.1 s. 2. Ventricular systole. The ventricular muscle contracts and expels the blood into the circulatory system.
Anatomy And Physiology
1595 Words | 7 PagesThe ventricles now relax (diastole) and any backflow of blood causes the semilunar valves to close causing the second sound of the heartbeat. Cardiac muscle never tires. The heart has its own blood supply from the coronary arteries which come from the aorta and the coronary veins which empty into the vena cava. A blockage in the coronary artery causes a heart attack. The heartbeat is controlled by the pacemaker, situated in the walls of the right atrium.
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