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How does weight training increase muscle fiber size by increasing the number of myofibrils?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 9y ago
Wiki User
∙ 12y agoMyofibrillar hypertrophy occurs due to increases in the number of myosin/actin filaments (sarcomeres) inside the cell. This leads to increased strength and size of the contractile unit of muscle. Ultimately this means greater force production. This is often referred to as functional muscle, while sarcoplasmic hypertrophy is referred to as non-functional muscle.
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How can exercise change muscle strength?
Muscle strength depends on the thickness of the fibers and the number of fibers contract at one time. And in order to compensate for the added work load,myofibrils are added in in order to increase the thickness of the fibers (more myofibrils,more thickness), hence a stronger muscle.
What shortens muscle contraction?
myofibrils
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.
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.
Does increased muscle density mean more myofibrils per muscle fiber?
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.
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
Individual muscle cells are called?
muscle fibre
What part of the muscle cell contains myofibrils?
The sarcoplasm
What is the contractile organelle of skeletal muscle fibers is?
myofibrils
Increasing the muscle temperature can increase flexibility by how much?
30%
What are the elements of muscle tissue that contract and relax and elongate?
Myofibrils
What are the structures within the muscle fiber that shorten to cause skeletal muscle fiber contraction?
Myofibrils
