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The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.. In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°.
A macron (/ ˈ m æ k r ɒ n, ˈ m eɪ-/ MAK-ron, MAY-) is a diacritical mark: it is a straight bar ¯ placed above a letter, usually a vowel.Its name derives from Ancient Greek μακρόν (makrón) 'long' because it was originally used to mark long or heavy syllables in Greco-Roman metrics.
Ā, lowercase ā ("A with macron"), is a grapheme, a Latin A with a macron, used in several orthographies.Ā is used to denote a long A.Examples are the Baltic languages (e.g. Latvian), Polynesian languages, including Māori and Moriori, some romanizations of Japanese, Persian, Pashto, Assyrian Neo-Aramaic (which represents a long A sound) and Arabic, and some Latin texts (especially for ...
The heart is a muscular organ situated in the mediastinum.It consists of four chambers, four valves, two main arteries (the coronary arteries), and the conduction system. The left and right sides of the heart have different functions: the right side receives de-oxygenated blood through the superior and inferior venae cavae and pumps blood to the lungs through the pulmonary artery, and the left ...
The left heart has two chambers: the left atrium and the left ventricle, separated by the mitral valve. [8] The left atrium receives oxygenated blood back from the lungs via one of the four pulmonary veins. The left atrium has an outpouching called the left atrial appendage. Like the right atrium, the left atrium is lined by pectinate muscles. [25]
A macron is a diacritic ¯ placed over a vowel originally to indicate that the vowel is long. When editing a Wikipedia page, macron characters appear below the edit box, and can be inserted into the edit box by clicking the appropriate character (in JavaScript-enabled browsers). A macron can also be input directly from the keyboard.
Anatomy photo:20:09-0106 at the SUNY Downstate Medical Center - "Heart: The Left Coronary Artery and its Branches" Anatomy figure: 20:04-02 at Human Anatomy Online, SUNY Downstate Medical Center - "Posterior view of the heart." "Obtuse marginal artery". Medcyclopaedia. GE. Archived from the original on 2012-02-05. Image at texheartsurgeons.com
Cardiac physiology or heart function is the study of healthy, unimpaired function of the heart: involving blood flow; myocardium structure; the electrical conduction system of the heart; the cardiac cycle and cardiac output and how these interact and depend on one another.