Muscular System

Does most muscle contain a fibers of the same type?


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2009-10-30 10:07:44
2009-10-30 10:07:44

a mixture of fiber types

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The heart is composed of cardiac muscle fibers. It is the same thing.

Yes, biologists often refer to skeletal muscle cells as fibers, although they aren't the same as plant fibers.

Most body movements involve isotonic muscle contractions: the muscle fibers either lengthen or shorten as they contract.An isometric contraction involves the muscle fibers staying the same length. Holding something steady, or pushing against a brick wall, are examples of isometric contraction.

You call it as cardiac muscles. The muscle fibers contract rhythmically. The muscle fibers are attached to each other end to end. This facilitates the conduction of the impulse. The muscle fiber can be stimulated to give you contraction of the the same.

You get stronger. The individual muscle fibers become thicker with more myofibrils inside them. The number of muscle cells stays the same, contrary to popular belief that you grow more muscle fibers, this is not true.

No. The heart muscle contracts in sections, first the top (atrium) then the bottom (ventricle). But when it is working properly, the heart muscle fibers contract together in large groups.

technically muscle fibres are classified as red or white but they are the same thing

Yes, it means that you will gain more myofibrils per muscle fiber. A muscle fiber is a muscle cell, and everybody has about the same number. When you train your muscles, they will develop more myofibrils inside the muscle cells. So you cannot change the number of muscle fibers, or cells, but you can change the number of fibers, or myofibrils, inside them. The end result is more muscle density, not more muscle cells.

ofcourse not; slow twitch muscle fibers are: * smaller in diameter * red in color * depend on oxidative phosphorylation for their ATP supply * are highly vascularized (better blood supply) * have more mitochondria * more myoglobin fast twitch muscle fibers * larger * white * glycolysis is the source of ATP * less vascularized * less mitochondria * less myoglobin

Pennate MusclesIn a pennate muscle, the fascicles form a common angle with the tendon. Because the muscle cells pull at an angle, contracting pennate muscles do not move their tendons as far as parallel muscles do. But a pennate muscle contains more muscle fibers--and, as a result, produces more tension--than does a parallel muscle of the same size. (Tension production is proportional to the number of contracting sarcomeres; the more muscle fibers, the more myofibrils and sarcomeres.)

Working out with weights will stress the muscles so that, while you rest, they rebuild bigger and stronger. Trauma to the Muscle: Activating The Satellite Cells When muscles undergo intense exercise, as from a resistance training bout, there is trauma to the muscle fibers that is referred to as muscle injury or damage in scientific investigations. This disruption to muscle cell organelles activates satellite cells, which are located on the outside of the muscle fibers between the basal lamina (basement membrane) and the plasma membrane (sarcolemma) of muscles fibers to proliferate to the injury site (Charge and Rudnicki 2004). In essence, a biological effort to repair or replace damaged muscle fibers begins with the satellite cells fusing together and to the muscles fibers, often leading to increases in muscle fiber cross-sectional area or hypertrophy. The satellite cells have only one nucleus and can replicate by dividing. As the satellite cells multiply, some remain as organelles on the muscle fiber where as the majority differentiate (the process cells undergo as they mature into normal cells) and fuse to muscle fibers to form new muscle protein stands (or myofibrils) and/or repair damaged fibers. Thus, the muscle cells' myofibrils will increase in thickness and number. After fusion with the muscle fiber, some satellite cells serve as a source of new nuclei to supplement the growing muscle fiber. With these additional nuclei, the muscle fiber can synthesize more proteins and create more contractile myofilaments, known as actin and myosin, in skeletal muscle cells. It is interesting to note that high numbers of satellite cells are found associated within slow-twitch muscle fibers as compared to fast-twitch muscle fibers within the same muscle, as they are regularly going through cell maintenance repair from daily activities

This is untrue. Gay people have muscle in the same percentages as straight people.

No, they are not the same, but they share a common target (the pallidum). Subthalamopallidal fibers project from the subthalamic nucleus to the globus pallidus. Striatopallidal fibers project from the striatum into the globus pallidus.

Skeletal muscle cells, for instance, contain many mitochondria because the energy consumed in the contraction of the sarcomere is enormous. Skin cells, for instance, contain much less mitochondria as the cellular work the need to do is minimal compared to skeletal muscle cells.

Muscle fibers converge into tendinous material that attaches a portion or body of the muscle to specific bony landmarks on the skeleton. The place that muscle fibers become tendon can be called, for lack of a better term, a musculotendinous junction. Tendons attach muscles to bones (just as ligaments attach bone to bone) at landmarks on the skeleton. Most of these landmarks have names of their own, based on things like shape, location and/or size. Depending upon the depth to which one wants to focus on these attention points, they can be further divided into origin and insertion points, meaning that a muscle originates and ends at specific, mappable points on the skeleton and those points are, for the most part, the same for each person.

no most of them contain semen you dick head

the striated portions of the intrafusal fiber contract to keep the spindle taut at different muscle lengths. If the whole muscle is stretched, the muscle spindle is also stretched, triggering sensory nerve impulses on its nerve fiber. These sensory fibers synapse in the spinal chord with lower motor neurons leading back to the same muscle. Impulses triggered by stretch of the muscle spindle contract the skeletal muscle.

Uterine fibroids refer to benign tumors that start in the uterus. They are the same smooth muscle fibers as the uterine wall but they are denser than normal uterine wall.

Heart muscle is striated but not in the same way that skeletal muscle is. Cardiac muscle is a type of involuntary striated muscle found only in the walls of the heart.Cardiac and skeletal muscle are similar in that both appear to be striated in that they contain sarcomeres. In striated muscle, such as skeletal and cardiac muscle, the actin and myosin filaments each have a specific and constant length on the order of a few micrometers, far less than the length of the elongated muscle cell (a few millimeters in the case of human skeletal muscle cells).The filaments are organized into repeated subunits along the length. These subunits are called sarcomeres. The sarcomeres are what give skeletal and cardiac muscles their striated appearance of narrow dark and light bands, because of the parallel arrangement of the actin and myosin filaments.However, cardiac muscle has unique features relative to skeletal muscle. For one, the myocytes are much shorter and are narrower than the skeletal muscle cells, being about 0.1 millimeters long and 0.02 millimeters wide .Furthermore, while skeletal muscles are arranged in regular, parallel bundles, cardiac muscle connects at branching, irregular angles.Anatomically, the muscle fibers are typically branched like a tree branch. In addition, cardiac muscle fibers connect to other cardiac muscle fibers through intercalcated discs and form the appearance of a syncytium (continuous cellular material).These intercalcated discs, which appear as irregularly-spaced dark bands between myocytes, are a unique and prominent feature of cardiac muscle .

spelled the same, muscle.

One advantage of using synthetic fibers is that they can be created when there is a deficit in natural fibers. One disadvantage is that they do not always work the same way that natural fibers do.

Muscle milk is usually the same price at most locations. GNC is a great place to try and purchase it.

Yes, It does. :) Cardiac muscle have a nucleus, same as skeletal muscle and smooth muscle

they contain the same elements in the same ratio.

Yes, however the expression pattens differ. So they have differnent genes "switched" on or off

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