左心室
WordNet
- arises near the apex of the heart and empties into the coronary sinus (同)vena posterior ventriculi sinistri
- toward or on the left; also used figuratively; "he looked right and left"; "the political party has moved left"
- a turn toward the side of the body that is on the north when the person is facing east; "take a left at the corner"
- the hand that is on the left side of the body; "jab with your left" (同)left_hand
- those who support varying degrees of social or political or economic change designed to promote the public welfare (同)left wing
- location near or direction toward the left side; i.e. the side to the north when a person or object faces east; "she stood on the left"
- intended for the left hand; "I rarely lose a left-hand glove" (同)left-hand
- being or located on or directed toward the side of the body to the west when facing north; "my left hand"; "left center field"; "the left bank of a river is bank on your left side when you are facing downstream"
- of or belonging to the political or intellectual left
- a chamber of the heart that receives blood from an atrium and pumps it to the arteries (同)heart_ventricle
- one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid
PrepTutorEJDIC
- leaveの過去・過去分詞
- 《名詞の前にのみ用いて》『左の』,左方の / 《しばしばl-》(政治上の)左翼の,左派の,革新派の / 左に,左方に / 《通例 the ~》『左』,左方,左側 / 《しばしばthe L-》左翼の政党(団体),左派 / 〈U〉(野球で)左翼,レフト(left field);〈C〉左翼手(left fielder) / 〈C〉(ボクシングで)左手打ち
- (脳髄・喉頭などの)室,空洞,(心臓の)心室
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2014/01/27 21:03:44」(JST)
[Wiki en表示]
Left ventricle |
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The heart, with cutaways, as viewed from the left side. |
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Left ventricle at lower left, cutaway shows some internal cavity detail. |
Latin |
ventriculus sinister cordis |
Gray's |
subject #138 534 |
System |
Circulatory System |
Artery |
anterior interventricular branch of left coronary artery |
Vein |
posterior vein of the left ventricle |
Precursor |
primitive ventricle, bulbus cordis |
MeSH |
Left+Ventricle |
The left ventricle is one of four chambers (two atria and two ventricles) in the human heart. It receives oxygenated blood from the left atrium via the mitral valve, and pumps it into the aorta via the aortic valve.
Contents
- 1 Shape
- 2 Development
- 3 Function
- 4 Pumping volume
- 5 Additional images
- 6 External links
Shape[edit]
The left ventricle is shorter and more conical in shape than the right, and on transverse section its concavity presents an oval or nearly circular outline. It forms a small part of the sternocostal surface and a considerable part of the diaphragmatic surface of the heart; it also forms the apex of the heart. The left ventricle is thicker and more muscular than the right ventricle because it pumps blood at a higher pressure.
Development[edit]
By teenage and adult age, its walls have thickened to three to six times greater than that of the right ventricle. This reflects the typical five times greater pressure workload this chamber performs while accepting blood returning from the pulmonary veins at ~80mmHg pressure (equivalent to around 11 kPa) and pushing it forward to the typical ~120mmHg pressure (around 16.3 kPa) in the aorta during each heartbeat. (The pressures stated are resting values and stated as relative to surrounding atmospheric which is the typical "0" reference pressure used in medicine.)
Function[edit]
For excellence of health, the left ventricular muscle must:
- (a) relax very rapidly after each contraction so as to fill rapidly with oxygenated blood flowing from the lung veins, i.e. diastolic relaxation and filling.
- (b) contract rapidly and forcibly to force the majority of this blood into the aorta, overcoming the much higher aortic pressure and the extra pressure required to stretch the aorta and other major arteries enough to expand and make room for the sudden increase in blood volume, i.e. systolic contraction and ejection.
- (c) be able to rapidly increase or decrease its pumping capacity under nervous system control.
Pumping volume[edit]
Typical healthy adult heart pumping volume is ~5 liters/min, resting. Maximum capacity pumping volume extends from ~25 liters/min for non-athletes to as high as ~45 liters/min for Olympic level athletes.
Additional images[edit]
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Anterior (front) view of heart and lungs.
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Base and diaphragmatic surface of heart.
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Sectional view of left atrium and left ventricle.
External links[edit]
- Photo of dissection at uc.edu
- Left Ventricle - Cell Centered Database
Anatomy of torso, cardiovascular system: heart (TA A12.1, TH H3.09.01, GA 5.524)
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General |
Surface |
- base
- apex
- grooves
- coronary/atrioventricular
- interatrial
- anterior interventricula
- posterior interventricular
- surfaces
- sternocostal
- diaphragmatic
- borders
- openings of smallest cardiac veins
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Internal |
- atria
- interatrial septum
- musculi pectinati
- sulcus terminalis
- ventricles
- interventricular septum
- trabeculae carneae
- chordae tendineae
- papillary muscle
- valves
- cusps
- atrioventricular septum
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Chambers |
Right heart |
- (venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of inferior vena cava, valve of coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula) → pulmonary valve → (pulmonary artery and pulmonary circulation)
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Left heart |
- (pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)
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Layers |
Endocardium |
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Myocardium |
- conduction system: cardiac pacemaker
- SA node
- AV node
- bundle of His
- Purkinje fibers
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Pericardial cavity |
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Pericardium |
- fibrous pericardium
- sternopericardiac ligaments
- serous pericardium
- epicardium/visceral layer
- fold of left vena cava
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noco/cong/tumr, sysi/epon, injr
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proc, drug (C1A/1B/1C/1D), blte
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UpToDate Contents
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- 1. 左心室の評価における経食道心エコー transesophageal echocardiography in the evaluation of the left ventricle
- 2. 急性心筋梗塞後の左室瘤および仮性左室瘤 left ventricular aneurysm and pseudoaneurysm following acute myocardial infarction
- 3. 左冠動脈主幹部病変のマネージメント management of left main coronary artery disease
- 4. 心筋症の心エコーによる認識 echocardiographic recognition of cardiomyopathies
- 5. 左脚前枝ブロック left anterior fascicular block
English Journal
- The neuronal control of cardiac functions in Molluscs.
- Kodirov SA.AbstractIn this manuscript, I review the current and relevant classical studies on properties of the Mollusca heart and their central nervous system including ganglia, neurons, and nerves involved in cardiomodulation. Similar to mammalian brain hemispheres, these invertebrates possess symmetrical pairs of ganglia albeit visceral (only one) ganglion and the parietal ganglia (the right ganglion is bigger than the left one). Furthermore, there are two major regulatory drives into the compartments (pericard, auricle, and ventricle) and cardiomyocytes of the heart. These are the excitatory and inhibitory signals that originate from a few designated neurons and their putative neurotransmitters. Many of these neurons are well-identified, their specific locations within the corresponding ganglion are mapped, and some are termed as either heart excitatory (HE) or inhibitory (HI) cells. The remaining neurons are classified as cardio-regulatory, and their direct and indirect actions on the heart's function have been documented. The cardiovascular anatomy of frequently used experimental animals, Achatina, Aplysia, Helix, and Lymnaea is relatively simple. However, as in humans, it possesses all major components including even trabeculae and atrio-ventricular valves. Since the myocardial cells are enzymatically dispersible, multiple voltage dependent cationic currents in isolated cardiomyocytes are described. The latter include at least the A-type K(+), delayed rectifier K(+), TTX-sensitive Na(+), and L-type Ca(2+) channels.
- Comparative biochemistry and physiology. Part A, Molecular & integrative physiology.Comp Biochem Physiol A Mol Integr Physiol.2011 Oct;160(2):102-16. Epub 2011 Jun 25.
- In this manuscript, I review the current and relevant classical studies on properties of the Mollusca heart and their central nervous system including ganglia, neurons, and nerves involved in cardiomodulation. Similar to mammalian brain hemispheres, these invertebrates possess symmetrical pairs of g
- PMID 21736949
Japanese Journal
- Limitations and Problems of Assessment of Mechanical Dyssynchrony in Determining Cardiac Resynchronization Therapy Indication : Is Assessment of Mechanical Dyssynchrony Necessary in Determining CRT Indication? (Con)
- ISHIKAWA Toshiyuki
- Circulation journal : official journal of the Japanese Circulation Society 75(2), 465-471, 2011-01-25
- … Contraction delay of the lateral left ventricular free wall can be improved by biventricular pacing. … Cardiac resynchronization therapy (CRT) is based on the principle of resynchronizing un-uniformed contraction of the ventricle. …
- NAID 10027427528
Related Links
- The left ventricle is one of four chambers (two atria and two ventricles) in the human heart. It receives oxygenated blood from the left atrium via the mitral valve, and pumps it into the aorta via the aortic valve. ...
Related Pictures
★リンクテーブル★
[★]
- 英
- left ventricle (Z), LV
- ラ
- ventriculus sinister
- 同
- 左室
- 関
- 心室、心臓
[show details]
左心室 : 約 331,000 件
左室 : 約 332,000 件
[★]
心室
- 関
- cardiac ventricle、left ventricle、right ventricle、ventricle、ventricular
[★]
心室
- 関
- heart ventricle、left ventricle、right ventricle、ventricle、ventricular
[★]
- 関
- left ventricle、LV
[★]
- 同
- 胸骨傍左室長軸断面, LL
[★]
- 関
- cardiac ventricle、cerebral ventricle、cerebroventricle、cerebroventricular、heart ventricle、ventricular、ventriculi、ventriculus
[★]
- 関
- leave