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What muscle fibers have fast contractions and a high level of glycogen stores?
fast-twitch fibers
How many muscle cells are in a human body?
The human body contains approximately 600 to 700 skeletal muscles, which are made up of millions of muscle cells, or muscle fibers. Estimates suggest there are roughly 250 billion muscle fibers in the body when considering all types of muscle tissue, including skeletal, cardiac, and smooth muscle. The exact number can vary depending on individual factors such as size and fitness level.
The all-or-none law applies to skeletal muscle function at what level?
The all-or-none law applies to individual muscle fibers within a skeletal muscle. This means that when a muscle fiber is stimulated by a motor neuron, it will either contract maximally or not at all, depending on whether the stimulus reaches the threshold for activation.
What level of muscle use the creatine-phosphate powers?
The level of muscle that creatine-phosphate powers is striated or skeletal muscles.
What is the level of organization of muscle?
Organ.
What is muscle tone and what caused it?
Muscle tone is the level of firmness or slight contraction in a resting muscle. Nerve fibers are active while the muscles are contracting as messages are unconsciously being fired to maintain this partially contracted state. Here the few muscle fibers contract at any given time.
What level of organization is cardiac muscle?
Cardiac muscle is a tissue. It is made up of multiple cells working together.
Which is the level of organization in the skeletal system?
The skeletal system is organized at the organ system level in the body. It consists of bones, cartilage, tendons, and ligaments that work together to support the body, protect internal organs, and facilitate movement.
What level of organization is the cardiac muscle?
Cardiac muscle is a tissue. It's a group of cells working together for a common function.
How does the threshold stimulus influence muscle contraction?
The threshold stimulus is the stimulus required to create an action potential. So any stimulus under this level will not cause muscle contraction, while a stimulus above this level will cause the muscle to contract. The higher the stimulus the more muscle fibers are recruited, and thus the higher the response.
What is the difference between a muscle organ a muscle fiber myofibril and a myofilaments?
A muscle organ is made up of several muscle fibers, which are the individual cells that contract to produce movement. Each muscle fiber contains myofibrils, which are long, thread-like structures that run the length of the fiber and are responsible for contraction. Myofibrils are composed of myofilaments, the smallest units, which include actin (thin filaments) and myosin (thick filaments) that interact to facilitate muscle contraction. Together, these structures create the hierarchy of muscle organization from the whole muscle down to the molecular level.
What is the significance of a slightly elevated creatine kinase blood test presumed not cardiac related?
cpk enzymes are found in cardiac muscle, skeletal muscle and the brain, cpk will be elevated 10 to 25 times the normal level following a myocardial infarction, they will also be elevated after a trauma to skeletal muscle and in progressive muscular dystrophy, cpk can be elevated after strenuous exercise.
