Human Anatomy and Physiology

Does increased muscle density mean more myofibrils per muscle fiber?

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2010-10-26 20:21:16
2010-10-26 20:21:16

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.

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There are hundreds of myofibrils in each muscle fiber


Myofibrils The sarcomere is the unit of muscular contraction.


The organization of a skeletal muscle from smallest to largest is as follows: myofilaments > myofibrils > muscle fiber > fascicle > muscle


Myofibrils are thread like structures found in muscle fiber composed of bundles of myofilaments.


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.


The largest skeletal muscle connective tissues are fascicles, which are bundles of fibers, which are made of myofibrils, which consist of myofilaments.


No. Atrophy is the wasting away of muscle tissue due to disuse, abuse (such as injury and overtraining), or some diseases.


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.


Myofibrillar 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.


The major parts of skeletal muscle fiber consist of thick filaments and thin filaments.


Short Answer:A myofibril is smaller than a myofiber (muscle fiber).Long Answer:Skeletal Muscle Hierarchy:Muscle OrganPerimysium = white fibrous connective tissue & areolar connective tissue that surrounds each fascicleFascicle = bundle of skeletal muscle fibersEndomysium = areolar connective tissue that surrounds each muscle fiberMuscle Fiber ( Myofiber) = a muscle cellMyofibrils = contractile protein organellesMyofilaments = contractile proteins composed of:thick filaments = made of myosinthin filaments = made of actin


which fiber has highest density ?


The number of cells depends on how large the muscle is; muscles consist of fiber bundles, which are made up of myofibrils. A sarcomere is one of the segments that the myofibril is divided into. In each fiber bundle there are multinucleate cells, which can extend the length of the skeletal muscle. So, the number of cells in a skeletal muscle depends on the size of the muscle. for example, the number of cells in one of our triceps larger than one of the small muscles in a finger.


Muscle fiber is not a connective tissue.



The site where a nerve fiber connects to the muscle is a neuromuscular junction.


the protein myoglobin pushes along actin to shorten the muscle fiber


The smaller fiber in a muscle fiber is called a myofibril. A band of tissue that connects bone to bone is called a ligament.


The sacromere with the proteins actin and myosin allow the muscle cell (fiber) to contract.


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.


A muscle fiber collectively describes the long, multi-nucleated muscle cells which make up a skeletal muscle. They are termed fascicles when they are in bundles.


This question is confusing. Are you asking if you see only a relaxed muscle fiber in EMs? Yes, you would only see that, not a contracted muscle fiber. The preparation could only be of a relaxed fiber.



It's very simple-- it's called a 'muscle fiber tear.'


A muscle fiber is made of many contractile units called sarcomeres.



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