fast twitch
Muscle cells, particularly skeletal muscle fibers, have a high number of mitochondria. This abundance is necessary because these cells require significant energy to contract and perform their functions. Additionally, heart muscle cells (cardiomyocytes) also contain many mitochondria to meet their continuous energy demands for maintaining heart function.
Muscle cells have more mitochondria because they require more energy to contract than skin cells.
Skeletal muscles contain elongated muscle fibers arranged in sheets and have multiple nuclei. Smooth muscles and cardiac muscles also have elongated cells, but they are not arranged in sheets and do not have multiple nuclei in each cell.
Here you have a special kind of muscle called as cardiac muscles. Cardiac muscle has got fallowing properties. They are automaticity, excitability, conductivity, contractility, rhythmicity, and refractoriness. That means it contracts. It contracts rhythmically. It contracts automatically of it's own. It can be stimulated. It conducts the impulse across the length. Once it contracts, it will not contract for some time again. These properties have many implications. The different types of heart cells contract at different pace. The cells from SA node contract at the rate of about 76 per minute. That of AV node contract at the speed of about 60 per minute. The cells of atrium contract with the speed of in between the both types of cells. The cells of ventricle contract at the speed of about 36 per minute. So the final rate of contraction of the heart is decided by SA node. it is called as pace maker. The impulse has to be conducted across the heart in synchronized manner. For that the heart muscle is designed to conduct the electrical impulse. Once stimulated, the muscle fiber takes some rest. That is needed so that the muscle can function non-stop for years together. The property of excitability is needed so that the muscle can be stimulated by a stimulus.
matrix which consists of fibers and ground substance
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.
Type I muscle fibers
Smooth muscle cells contract in response to fluid flow.
Muscle ( cardiac Muscle)
Muscle cells contract, causing movement and our heartbeat.
The heart is comprised of specialized cardiac muscle fibers.
Slow Twitch (:
Muscle cells, particularly skeletal muscle fibers, have a high number of mitochondria. This abundance is necessary because these cells require significant energy to contract and perform their functions. Additionally, heart muscle cells (cardiomyocytes) also contain many mitochondria to meet their continuous energy demands for maintaining heart function.
Skeletal muscle
Charley horse is a type of muscle spasm that typically occurs in the leg. The muscle spasm causes the muscle to contract by itself and it cannot be relaxed normally.
Cardiac muscle fibers.
Distance, hands down. Sprinting will build your fast-twitch muscle fibers, which are typically larger than slow-twitch muscle fibers. You hardly ever see a sprinter with the skinny legs of a distance runner. It just doesn't happen.