HUMAN MUSCLE STRUCTURE, MUSKELN DES...

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Vintage-Views Antique Prints and Maps :: Antique Prints :: Scientific :: Medicine :: HUMAN MUSCLE STRUCTURE, MUSKELN DES MENSCHEN,1894 Original Antique Wood Engraving

HUMAN MUSCLE STRUCTURE, MUSKELN DES MENSCHEN,1894 Original Antique Wood Engraving

Muscle (from Latin musculus "little mouse", referring to muscles like the biceps which pop up as though a mouse were scurrying about under the skin is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. There are three types of muscle: * Skeletal muscle or "voluntary muscle" is anchored by tendons to the bone and is used to affect skeletal movement such as locomotion. * Smooth muscle or "involuntary muscle" is found within the walls of organs and structures such as the oesophagus, stomach, intestines, bronchi, uterus, ureters, bladder, and blood vessels, and unlike skeletal muscle, smooth muscle is not under conscious control. * Cardiac muscle is also an "involuntary muscle" but it's a specialized kind of muscle found only within the heart. The biggest difference between cardiac muscles and other muscles is that cardiac muscles create their own electrical shock. Cardiac and skeletal muscle are "striated" in that they contain sarcomere and are packed into highly-regular arrangements of bundles; smooth muscle has neither. Striated muscle is often used in short, intense bursts, whereas smooth muscle sustains longer or even near-permanent contractions. Skeletal muscle is further divided into several subtypes: * Type I, slow oxidative, slow twitch, or "red" muscle is dense with capillaries and is rich in mitochondria and myoglobin, giving the muscle tissue its characteristic red color. It can carry more oxygen and sustain aerobic activity. * Type II, fast twitch, muscle has three major kinds that are, in order of increasing contractile speed: o a) Type IIa, which, like slow muscle, is aerobic, rich in mitochondria and capillaries and appears red. o b) Type IIx (also known as type IId), which is less dense in mitochondria and myoglobin. This is the fastest muscle type in humans. It can contract more quickly and with a greater amount of force than oxidative muscle, but can sustain only short, anaerobic bursts of activity before muscle contraction becomes painful (often incorrectly attributed to a build-up of lactic acid). N.B. in some books and articles this muscle in humans was, confusingly, called type IIB. o c) Type IIb, which is anaerobic, glycolytic, "white" muscle that is even less dense in mitochondria and myoglobin. In small animals like rodents or rabbits this is the major fast muscle type, explaining the pale color of their meat. PRINT SHOWS THE FRONT AND BACK VIEW OF THE HUMAN FORM

Published for Joseph Meyer Meyers Konversations

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SKU	0527673k6
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