Muscular System

Are slow twitch and fast twitch muscle fibers the same size?

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2009-01-28 13:39:30
2009-01-28 13:39:30

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

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

there actually called fast twitch fibres and slow twitch fibres ! and fast twitch fibres are in your muscles and they determine if your going to be fast at a certain thing or the slow twitch fibres the same but slowly :) if you have more fast twitch fibres you will be faster then someone with more slow twitch fibres. like usain bolt he has a lot of fast twitch fibres that's why he is so fast !

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.

Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons (the terms twitch tension, twitch force, and fiber contraction are also used).

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

Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten, or remain the same. Although the term contraction implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons (the terms twitch tension, twitch force, and fiber contraction are also used).

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.

It takes a few days, beginning immediately. This is why you shouldn't train the same muscles for a few days. It takes a little less though for slow-twitch fibers, like those of your abs.

It takes a few days, beginning immediately. This is why you shouldn't train the same muscles for a few days. It takes a little less though for slow-twitch fibers, like those of your abs.

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.

Osteopathic Sports Energy Technique (SET), founded by Dr Shahin Pourgol, president of National University of Medical Sciences & the National Academy of Osteopathy, is a form of advanced osteopathic technique designed to improve athletic performance by increasing speed. This is achieved by working on the fast twitch type IIb skeletal muscle fibres. Athletes can achieve dramatic increase in speed often after the first session. They can run, kick, jump or punch faster often after doing the first set of S.E.T. techniques. Muscle tissue consists of fibres (cells) that are highly specialized for the active generation of force for contraction. Because of this characteristic, muscle tissue provides motion, maintenance of posture, and heat production. Based on certain structural and functional characteristics, muscle tissue is classified into three types: cardiac, smooth and skeletal. Based on various structural and functional characteristics, skeletal muscle fibres are classified into three types: Type I fibres, Type II b fibres and type II a fibres. Type IIb fibres, also called fast twitch or fast glycolytic fibres; contain a low content of myoglobin, relatively few mitochondria, relatively few blood capillaries and large amounts glycogen. Type II b fibres are white, geared to generate ATP by anaerobic metabolic processes, not able to supply skeletal muscle fibres continuously with sufficient ATP, fatigue easily, split ATP at a fast rate and have a fast contraction velocity. Generally people are born with an average of 50% slow and 50% fast twitch fibres. Sprinters with proper training change this ratio to 80% fast twitch fibres in the leg muscles while marathon runners change the ratio with advanced training to 80% slow twitch fibres in the lower limbs muscles. Because fast twitch fibers use anaerobic metabolism to create fuel, they are much better at generating short bursts of strength and speed than slow muscles. However, they fatigue more quickly. Fast twitch fibers generally produce the same amount of force per contraction as slow muscles, but they get their name because they are able to fire more rapidly. Having more fast twitch fibers can be an asset to athletes since they need to quickly generate a lot of force.

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.

Generally not as there are many parallel fibres that are part of the same circuit and some sort of coordination between the fibres are needed before a muscle twitch can be detected. This is either temporal or spatial summation.

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.

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.)

I have the same thing. There is no problem. It just means you have either a muscle twitch or a strong heart beat.

Muscle Structure The muscles themselves of black people, white people, or any other human being are not fundamentally different. We are all the same species. Black men tend to have more fast-twitch muscle fibers which is good for sprinting, basketball, boxing, etc. White men tend to have more slow-twitch muscle mass, just look at powerlifting and strong man competitions. Nearly all the world's strongest men are white. Consider the traditional builds of historically white groups like the Vikings, Spartans, Celts etc. Many consider them the world's fiercest warriors. There is also an issue of shading. The color black or any dark color for that matter further accentuates the muscle tone of the body. That is why when white men are tan they tend to look leaner and more muscular.

Muscular endurance is very important for people playing sports and who have to sustain an activity for long periods of time. Muscular endurance is determined by how well your slow twitch muscle fibers are developed. In case your wondering what slow twitch muscle fibers are, I will explain. There are generally two types of muscle fibers in your body, slow twitch and fast twitch. Slow twitch muscle fibers cannot exert as much force as fast twitch, but can sustain an effort over a much greater period of time. Fast twitch muscle fibers can exert a great amount of force but for a very limited amount of time. Therefore, slow twitch equals endurance, while fast twitch equals strength.If you are looking to improve muscular endurance, the best way would be to involve yourself in just about any cardivascular activity, such as running, biking, and playing sports. Even walking will help you stay healthy and condition your leg muscles, to a point. If you are looking to improve the endurance of your upper body, bodyweight exercises such as chin-ups, push-ups, triceps dips, etc., will improve this, and your strength as well.Muscular endurance is the ability of a muscle or group of muscles to sustain repeated contractions against a resistance for an extended period of time. The combination of strength and endurance. Muscular Endurance is the ability of a muscle to do continuous work over a long period of time.Muscular endurance is a crucial element of fitness for the athletes such as swimmers, rowers, distant runners and cyclists. It is important for a number of team sports such as field hockey, soccer and Australian Rules football. But what does muscular endurance mean? Muscular endurance is a combination of strength and endurance of muscles. Muscular endurance is the ability of a muscle or a group of muscles to perform repeated muscular contractions against resistance for an extended period of time. It is associated with the muscle's ability to continue to perform without fatigue. In order to improve your muscular endurance, you should try some cardiovascular exercises such as jogging, walking, biking, dancing or bicycling. Some bodyweight exercises such as push-ups, chin-ups, triceps dips, etc. would improve the endurance and strength of upper body muscles. Muscular endurance is related to the length of time a muscle can perform repeated muscle actions against a sub-maximal resistance. It is determined by the maximum number of repetitions performed at a given percentage of a person's one-repetition maximum.Different levels of muscular endurance are required for different sports. There are three major categories of muscular endurance such as power endurance, short-term muscular endurance and long-term muscular endurance. Athletes such as sprinters, martial artists, baseball pitchers, fencers, wrestlers and tennis players generate powerful movements repetitively. A certain level of power endurance is needed in order to maintain the same amount of power with each effort. Short-term muscular endurance training is beneficial for sports and events, which consist of bouts of exercise lasting for about 30 seconds to 2 minutes. Muscular endurance training helps athletes tolerate high levels of lactic acids and cope with fatigue. Long-term muscular endurance is required for continuous, steady-state events such as triathlon, marathon and rowing, which last more than 2 minutes. In order to improve your muscular endurance, you must know about muscle fitness.

Racial sterotypical overgeneralization. There has been some scientific theories/evidence that sprinters with ancestry to west African tribes have more fast twitch muscle fibers, however, to apply this theory generally to all blacks is ridiculous. This leads to ridiculous theories like blacks in America are more athletic because strong slaves were favored and blacks in America are less intelligent for the same reason. Its racism played out through generalizations.

Done in the right form, absolutely. It is, however, possible to do training that has little or no influence on muscle mass due to the makeup of muscle. Strength training with lower rep ranges (1-5 repetitions per set) and bodybuilding style hypertrophy training, which tends to have rep ranges of between 8-20, certainly can increase muscle mass either through one of two potential mechanisms of growth. Longer duration or repetition endurance work, due to the nature of the slower twitch muscle fibers which do not have the same propensity for growth as those used in heavier weight work, does not cause the same increase in mass.

It all depends on repetitions. If you can Bench press 'X' amt of weight 10 times and you can only perform 10 push ups, then you're most likely going to get the same trianing effect out of it. The typical trained athlete can perform many push ups and will perform a similar weight lifting exercise for lower reps, example a Bench Press... The effect on these two types of training and the effect on the type of muscle it would build are as follows: Say you can push up 30 times, this is going to help build your endurance, now let's say you can bench press 150lbs 30 times....you're still going to be imporving muscular endurance, now let's say you rack so more weight on the bench press and you have on 225lbs and you can only lift it 10 times, it will give the training effect of hypertrophy, MEANING. growth of your muscle. Most exercise scientists agreee that these rep ranges give these following effects to the body: 12 reps and higher = more endurance work 8-10 reps = muscle mass training 7-5 reps = strength training 4 reps and lower = power training This is all a little dependent on genetics as well and if you're drug free or not, but this is a pretty sure fire way to know what kind of effect you're going to get from exercising. Your muscles are composed of two different types of fibers for two different types of workouts. These two types are fast-twitch and slow-twitch. Fast-twitch muscle fibers are used when you are lifting a large amount of weight only a few times (strength). Slow twitch muscle fibers are used when you are lifting a smaller amount of weight many times (endurance). When you do push-ups and pull-ups, you may be utilizing your fast-twitch muscles if you are weak and can only do a few reps. As your endurance increases, you will likely start using your slow-twitch muscles as they develop.

The answer is no. Calorically, they are the exact same. The only difference is the faster you run, the more anaerobic the run becomes meaning you are fueling your body with more glucose (ATP) as opposed to oxygen (aerobic). Muscularly, sprinting will develop fast twitch muscle which are powerful and big but lack endurance. Walking or jogging develops slow twitch muscle which are lean and stamina packed. That's why sprinters in the Olympics look jacked and long distance runners look super skinny and defined.


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