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DIFFERENCES BETWEEN ISOTONIC & ISOMETRIC CONTRACTION: 1-In isotonic contractions, where the tension in the muscle stays constant, a load is moved as the length of the muscle changes (shortens). There are two types of isotonic contractions: concentric and eccentric. A concentric contraction involves the muscle shortening to move a load. An example of this is the biceps brachii muscle contracting when a hand weight is brought upward with increasing muscle tension. As the biceps brachii contract, the angle of the elbow joint decreases as the forearm is brought toward the body. Here, the biceps brachii contracts as sarcomeres in its muscle fibers are shortening and cross-bridges form; the myosin heads pull the actin. An eccentric contraction occurs as the muscle tension diminishes and the muscle lengthens. In this case, the hand weight is lowered in a slow and controlled manner as the amount of cross-bridges being activated by nervous system stimulation decreases. In this case, as tension is released from the biceps brachii, the angle of the elbow joint increases. Eccentric contractions are also used for movement and balance of the body. 2-An isometric contraction occurs as the muscle produces tension without changing the angle of a skeletal joint. Isometric contractions involve sarcomere shortening and increasing muscle tension, but do not move a load, as the force produced cannot overcome the resistance provided by the load. For example, if one attempts to lift a hand weight that is too heavy, there will be sarcomere activation and shortening to a point, and ever-increasing muscle tension, but no change in the angle of the elbow joint. In everyday living, isometric contractions are active in maintaining posture and maintaining bone and joint stability. However, holding your head in an upright position occurs not because the muscles cannot move the head, but because the goal is to remain stationary and not produce movement. Most actions of the body are the result of a combination of isotonic and isometric contractions working together to produce a wide range of outcomes

Pharmaceutical selling skills

Successfully reported this slideshow.<p>We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.<p>220,372 views<p>Share<br>• Like<br>• Download<br>• ...<p>Published on Jul 25, 2011<p>KhaledSalama14 5 days ago<p>Adnan Gilgiti , Sale Promotion …

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What would Socrates think of homeless Greeks in caves today?

In the birthplace of democracy, near the Acropolis in Athens, there are caves where people with no homes are living. Twenty-five centuries after the classical philosopher Socrates, the caves are occupied again. Tradition says one of these caves was his prison.<p>The jobless tenants forage for food in …

Chemical weapons watchdog OPCW wins Nobel Peace Prize

The Nobel Peace Prize for 2013 has been awarded to the Organisation for the Prohibition of Chemical Weapons (OPCW).<p>The announcement was made in Oslo by the head of the Nobel Committee, Thorbjoern Jagland.<p>Much has been heard about chemical weapons inspectors but little about the organisation behind …

A male hoopoe gives his mate a courtship gift, as captured by award-winning photographer and environmental biologist Grzegorz Lesniewski From our gallery of WildPhotos2013: http://gu.com/p/3jec4/tw

Converting to Islam: British women on prayer, peace and prejudice Around 5,000 British people convert to Islam every year – and most of them are women. Five of them talk about prejudice, peace and praying in car parks http://gu.com/p/3jd84/fb Photograph: Felicity McCabe for the Guardian