Maximus Gage
The human heart is a muscular organ that pumps blood throughout the body. It has four chambers, two of which are ventricles. The left ventricle is conical in shape and has thicker walls than the right ventricle. It pumps oxygenated blood from the left atrium, through the aorta, and into the systemic circulation. The right ventricle, on the other hand, pumps deoxygenated blood from the right atrium into the pulmonary circulation through the pulmonary artery. The performance of the ventricles is measured by parameters such as end-diastolic volume, end-systolic volume, and ventricular pressure. The muscular interventricular septum separates the left and right ventricles. The ventricles also contain papillary muscles that project into their cavities and play a crucial role in valve function.
| Characteristics | Values |
|---|---|
| Number of ventricles in a four-chambered heart | 2 |
| Location in a four-chambered heart | Towards the bottom |
| Function | Collect and expel blood towards the peripheral beds within the body and lungs |
| Comparison with atria | Thicker walls and generate higher blood pressure |
| Left ventricle function | Maintains pulsatile blood flow against the relatively high-pressure systemic circulation |
| Left ventricle shape | Roughly conical and more elongated than the right ventricle |
| Left ventricle blood supply | Oxygenated blood from the left atrium |
| Left ventricle wall thickness | 3 times thicker than the right ventricle by young adulthood, increasing to 5-6 times thicker in adulthood |
| Left ventricle blood outflow | Oxygen-rich blood to the rest of the body |
| Left ventricle blood inflow | Blood from the pulmonary veins |
| Left ventricle pressure during systole | ~120mmHg (16.3 kPa) |
| Left ventricle pressure during diastole | ~80mmHg (11 kPa) |
| Left ventricle volumetric parameters | End-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV) and ejection fraction (Ef) |
| Left ventricle papillary muscles | Anterior and posterior |
| Right ventricle blood inflow | Deoxygenated blood from the right atrium |
| Right ventricle blood outflow | Blood into the pulmonary artery |
| Bands made from muscle that separate the right ventricle | Parietal, septal, and moderator band |
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What You'll Learn
Papillary muscles
The papillary muscles are pillar-like muscles found within the cavity of the ventricles, attached to their walls. They are an integral part of the proper functioning of cardiac valvular. They emerge from the inner walls of both the left and right ventricles and attach to the mitral and tricuspid valve leaflets via chordae tendinae.
The papillary muscles of the left ventricle are small myocardial structures that play an important role in the functioning of the mitral valve and the left ventricle. Typically, there are two groups of papillary muscles in the left ventricle: the anterolateral and the posteromedial groups. The anterolateral papillary muscle is often composed of one body or head, and the posteromedial papillary muscle usually has two bodies or heads. The anterolateral papillary muscle usually originates between the anterolateral and inferolateral walls, while the posteromedial muscle originates near the attachment of the inferior wall to the septum. The left ventricle has a higher workload, performing at five times greater pressure than the right ventricle. This is reflected in the thickness of the ventricular walls, with the left ventricle being three to six times thicker than the right ventricle.
The papillary muscles of the right ventricle are also attached to the chordae tendinae. However, the papillary muscles of the left ventricle are much larger than those of the right ventricle. The right ventricle receives deoxygenated blood from the right atrium via the tricuspid valve and pumps it into the pulmonary circulation. The right ventricle is separated from the left ventricle by the interventricular septum, which is divided into a thick, muscular part and a thin membranous part. The muscular part separates most of the left and right ventricles, while the membranous part separates the right chambers from the subaortic area.
The blood supply to the left anterolateral papillary muscles comes from branches of the left coronary artery, while the left posteromedial papillary muscles are supplied by the right coronary artery. In some cases, the left posteromedial papillary muscles receive blood from branches of the left circumflex artery. The anterolateral papillary muscle has a dual arterial supply, while the posteromedial papillary muscle has a single arterial supply. The papillary muscles are susceptible to various abnormalities, including congenital anomalies, neoplasms, and dysfunction due to ischemia.
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Mitral valve function
The mitral valve is one of the four valves in the human heart that control the direction of blood flow in the circulation. The mitral valve is part of the "left" heart and controls the flow of oxygen-rich blood from the lungs to the body. The mitral valve lies between the left atrium and the left ventricle, one of the two large chambers located toward the bottom of the heart.
During diastole, the mitral valve opens when the left ventricle relaxes, allowing blood from the left atrium to fill the decompressed left ventricle. The left ventricle receives oxygenated blood from the left atrium via the mitral valve and pumps it through the aorta via the aortic valve, into the systemic circulation. The left ventricle must be able to quickly relax and contract, increasing or lowering its pumping capacity under the control of the nervous system.
During systole, the left ventricle contracts, and the increase in pressure within the ventricle causes the mitral valve to close. This prevents blood from leaking into the left atrium and ensures that all the blood leaving the left ventricle is ejected through the aortic valve into the aorta and to the body. The aortic valve lies between the left ventricular chamber and the aorta, preventing blood from leaking back into the left ventricle after it has been ejected into the circulation.
The proper function of the mitral valve is dependent on a complex interplay between the annulus, leaflets, and subvalvular apparatus. The mitral valve works in conjunction with the interventricular septum, which functions as a conduit for part of the conducting system of the heart. The interventricular septum separates the two ventricles and allows for complex motions of the heart during each contraction.
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Ventricular pressure
The left ventricle has thicker walls than the right ventricle, reflecting the higher pressure workload it performs. During systole, ventricular pressure increases rapidly and becomes equal to the pressure in the aorta, causing the aortic valve to open and blood to be pumped to the body. The left ventricle must contract rapidly and forcibly to pump blood into the aorta, overcoming the higher aortic pressure. This extra pressure is also needed to stretch the aorta and other arteries to accommodate the increase in blood volume.
The right ventricle pumps blood into the pulmonary circulation to the lungs, while the left ventricle pumps blood into the systemic circulation through the aorta. The right ventricle has a lower resistance to blood flow compared to the left ventricle due to the lower pressure in the pulmonary circulation. The pressure-volume characteristics of the right ventricle differ from those of the left ventricle, with the right ventricle exhibiting a triangular pressure-volume loop due to the sequential pattern of its free wall contraction and the low resistance of the pulmonary vascular bed.
The performance of the ventricles can be assessed through various volumetric parameters, including end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), and ejection fraction (Ef). The pressure-volume relationship of the ventricles is important in understanding their function, with ventricular filling occurring along the end-diastolic pressure-volume relationship (EDPVR) and ventricular compliance influencing this process. The maximal pressure generated by the ventricle at any left ventricular volume is defined by the end-systolic pressure-volume relationship (ESPVR).
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Interventricular septum
The interventricular septum (IVS), or ventricular septum, is a wall of cardiac muscle and tissue that separates the left and right ventricles, the lower chambers of the heart. The interventricular septum is directed obliquely backward to the right and curved toward the right ventricle. Its margins correspond with the anterior and posterior interventricular sulci. The interventricular septum is composed of two parts: a thick, muscular part and a thin membranous part.
The muscular part of the interventricular septum separates most of the left and right ventricles from each other. The membranous part of the interventricular septum is positioned posteriorly and superiorly within the left ventricle and separates the right chambers from the subaortic area. The membranous ventricular septum is thin and fibrous, while the muscular interventricular septum constitutes the greater portion of the septum. The muscular part of the septum is supplied with blood by the left coronary artery and can be divided into three components: the inlet septum, trabecular septum, and infundibular septum. The posterior interventricular artery, a branch of the right coronary artery, supplies the posterior third of the interventricular septum, while the anterior interventricular artery, a septal branch of the left anterior descending artery, supplies the remaining anterior parts.
The interventricular septum functions as a conduit for part of the conducting system of the heart. The atrioventricular bundle of His transmits electrical impulses from the atrioventricular node to the Purkinje fibres in the ventricles, allowing for coordinated contraction of the heart. During each cardiac cycle, the interventricular septum contracts by shortening longitudinally and becoming thicker. This movement allows for complex motions of the heart during each contraction.
The interventricular septum is important for the healthy functioning of the heart. Conditions or diseases that affect the structure and function of the interventricular septum, such as hypertrophy, defects, or arrhythmias, can lead to ventricular pump failure and other serious consequences.
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Left ventricle vs. right ventricle
The heart is located under the ribcage, left of the breastbone, and between the lungs. It is composed of four chambers: the right atrium and ventricle, and the left atrium and ventricle. These chambers work together to manage the heartbeat and pump oxygenated and deoxygenated blood to the body and lungs, respectively.
The left ventricle is a muscular chamber of the heart that receives oxygenated blood from the left atrium via the mitral valve. The left ventricular muscle must be able to relax and contract quickly and adjust its pumping capacity under the control of the nervous system. The left ventricle pumps blood into the systemic circulation through the aorta. The walls of the left ventricle are thicker than those of the right ventricle, reflecting the higher pressure workload this chamber performs. The left ventricle also has larger papillary muscles compared to the right ventricle, which are necessary to resist greater pressure and keep the mitral valve closed during ventricular systole.
The right ventricle receives deoxygenated blood from the right atrium through the tricuspid valve. It then pumps the blood into the pulmonary circulation through the pulmonary valve and into the pulmonary artery. The right ventricle is separated by three bands made from muscle: the parietal, the septal, and the moderator band. The moderator band connects from the base of the anterior papillary muscle to the ventricular septum.
The interventricular septum separates the two ventricles and functions as a conduit for part of the conducting system of the heart. It is divided into two parts: a thick, muscular part and a relatively thin membranous part. The muscular part separates most of the left and right ventricles, while the membranous part separates the right chambers from the subaortic area.
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Frequently asked questions
Ventricles are one of two large chambers located at the bottom of the heart that collect and expel blood towards the body and lungs.
The papillary muscles project like nipples into the cavities of the ventricles. They are attached by fine strands of tendon to the valves between the atria and ventricles. The left ventricle also has anterior and posterior papillary muscles that are attached to chordae tendineae.
The papillary muscles prevent the valves from opening when the ventricles contract. They also provide a shorter route for electrical impulses to reach the anterior papillary muscle so that it contracts with the rest of the ventricle.
