Muscles Part II

Muscles Part II - Muscle'sPartII Skeletal Muscles is under...

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Muscle's Part II Skeletal Muscles Cardiac Muscles Smooth Muscles Functions of a muscle Motion Movement of Body Fluids Regulation of Body Fluids Body Stability Heat Production Characteristics of Muscles is under voluntary control which means a person can cause a muscle to contract or keep it relaxed. Skeletal muscles also have a sarcomere arrangement of the Myofilaments which gives them a striped or striated appearance. is involuntary which means one cannot consciously make the muscle contract. The cells have sarcomere structures just like skeletal muscle so they also look striped or striated. under involuntary control. These cells do not have a sarcomere arrangement of thick and thin fibers like skeletal and cardiac cells. Thus they do not look striped but have a smooth appearance. 1. Motion 2. Movement of Body Fluids 3. Regulation of Body Fluids 4. Body Stability 5. Heat Production Muscle provides contractile force to move the bones of the skeleton. Muscle provides the force needed to pump blood and move food through the digestive tract. Muscle allows for the controlled release of fluids from storage areas like the bladder. Muscle contraction is needed to prevent body collapse, it keeps the head upright and maintains general posture even when a person is simply sitting in a chair. Approximately 85% of all the heat generated by the body comes from muscle contraction. considered an excitable tissue which means it can be stimulated to perform a function. Actions potentials are generated by muscle and lead to contraction. When muscles contract they generate force and pull on whatever they are attached to.
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Muscle's Part II Muscles fasicles Production of Muscles Tendon Motor Neurons Motor Unit Strength of Contraction Muscle Group Opposing Pairs Prime Mover is the muscle that causes a movement. are also elastic. They have to be able to stretch and when the contraction is over, snap back to their original shape. All of these features are needed by muscles to perform their main functions. Muscle is wrapped in Connective Tissue and then Several muscle cells or fibers are then wrapped into bundles Finally a whole muscle is made by taking a number of fasicles and wrapping them in yet another layer of connective tissue. is made by taking all of these layers and collecting them at the end of the muscle into one bundle. Also is used to attach a muscle to a bone. Special nerves stimulate muscles to contract.Also, has a branching structure which allows it to send a signal to more than one muscle cell at a time. This allows some flexibility in controlling the strength of contraction. Once a muscle is stimulated it will contract to it's maximum and then relax. Stronger contractions require the stimulation of more muscle cells.
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Muscles Part II - Muscle'sPartII Skeletal Muscles is under...

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