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Does increased muscle density mean more myofibrils per muscle fiber?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
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What defines a sarcomere?
A sarcomere is the basic unit of a striated muscle. In humans, each muscle is composed of multiple bundles of muscle fibers or cells. Each fiber is comprised of myofibrils. In between sarcomeres lies the z line or the z disc. When strained, the z line appears dark with a distinct border. In the z lines, thin filaments reach toward the center, and overlap. These filaments all represent the structures of the sarcomeres.
Each muscle fiber is also called a?
muscle cell
What cellular organelle in muscle fiber corresponds to the endoplasmic reticulum?
Sarcoplasmic reticulum is the cellular organelle in muscle fiber that corresponds to the endoplasmic reticulum.
DO actin and myosin come from muscle fiber?
Yes
Consequences for inadequate fiber?
Not getting enough fiber in your diet can have many consequences. Low fiber leads to constipation and an increased risk of colon cancer.
What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
Myofibrils
What are the muscle structures from largest to smallest?
The organization of a skeletal muscle from smallest to largest is as follows: myofilaments > myofibrils > muscle fiber > fascicle > muscle
The repeating unit of a skeletal muscle fiber is the?
Myofibrils The sarcomere is the unit of muscular contraction.
What are Long threadlike structures found in muscle fibers?
Myofibrils are thread like structures found in muscle fiber composed of bundles of myofilaments.
What is a muscle striation made of?
The striations seen in skeletal muscle fibers are the result of the alignment of hundreds of myofibrils within each muscle fiber. A myofibril is a cylindrical organelle as long as the muscle fiber. Myofibrils contain bundles of myofilaments, which are actin proteins and myosin proteins. The differences in the thicknesses of the myofilaments accounts for the banding pattern of light and dark striations.
Why does an increase in the number of myofibrils increase muscle fiber size?
Research has found that the number of muscle fibers in the bundles that comprise each muscle group are set by genetics and cannot be increased. What can be increased is the size of the cells in these fibers, which is the goal of strength training.
How many sarcomere in a muscle cell?
There are unknown amounts of fibers (fibre) in muscles
Is atrophy the splitting of myofibrils in a muscle fiber through weight training?
No. Atrophy is the wasting away of muscle tissue due to disuse, abuse (such as injury and overtraining), or some diseases.
How does weight training increase muscle fiber size by increasing the number of myofibrils?
Weight training causes muscular hypertrophy, which is broken down into two types. Myofibrillar hypertrophy causes an increase in size of muscle fibers, which are made of myofibrils. Myofibrils are incapable of mitotic reproduction, so you cannot create new ones. Instead, satellite cells that are localized in the sarcolemma underneath the basal lamina are recruited into becoming new myofibrils when needed.
What is largest to smallest muscle fiber myofibril fascicle or filament?
The largest skeletal muscle connective tissues are fascicles, which are bundles of fibers, which are made of myofibrils, which consist of myofilaments.
Which fiber has highest density?
which fiber has highest density ?
What is an increase in the diameter of muscle fibers owing to the production of more myofibrils mitochondria sarcoplasmic reticulum and so forth?
Muscular Hypertrophy is the increase in muscle size due to increased number of myofibrils et al. Each muscle fiber (myocyte syncytium) consists of a cell membrane (sarcolemma) containing myofilaments actin and myosin arranged in end to end segments called sarcomeres. Muscle fibers are produced by fusion of multiple myoblasts during development, with the end result being a multinucleated syncytial cell which begins to produce myofilaments. Muscle growth occurs by production of additional myofilaments within each muscle fiber, the process called cellular hypertrophy. This results in enlargement of the whole muscle, also called hypertrophy. The number of myocytes remains the same. Existing myocytes can be repaired during regeneration following a severe injury. Satellite cells immediately adjacent to each muscle fiber proliferate and grow, fusing to eachother and existing damaged myofibers. Severe damage also results in fibrosis, or replacement of myofibers with stiff connective tissue, and results in impaired movement. In any case the number of muscle fibers remains the same.
