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Does a nerve provided impulses for many muscle fibers or just few?
A nerve can stimulate impulses to several muscle fibers. When muscle fibers are grouped they form a single muscle group like the biceps.
Twitch muscle fibers are used for prolonged activity and have?
____ twitch muscle fibers are used for prolonged activity and have ___ mitochodria. Slow; many
What composes the basement membrane and packages organs and includes a gel like matrix with all categories of fibers and many cell types?
Muscle
How are muscle fibers arranged to form a muscle?
Muscle fibers can be arranged into two basic structural patterns, fusiform and pinnate. Most human muscles are fusiform, with the fibers largely arranged parallel along the muscle's longitudinal axis. In many of the larger muscles the fibers are inserted obliquely into the tendon, and this arrangement resembles a feather. The fibers in a pinnate (feather) muscle are shorter than those of a fusiform muscle. The arrangement of pinnate muscle fibers can be single or double, as in muscles of the forearm, or multipinnate, as in the gluteus maximus or deltoid.
What is a motor unit is made up of?
Motor neurons and the muscle fibers they transmit signals toA motor unit is a collection of muscle fibers that contract as a single functional unit when stimulated by an impulse from a motor neuron. The actual size can vary greatly, from many large muscle fibers in the quadriceps muscle group per motor unit to just a few muscle fibers in the muscles of the fingers per motor unit.
How many myosin heavy chain isoforms?
There are several myosin heavy chain isoforms, with over 40 distinct types identified in various species, including humans. These isoforms are classified into different types based on their function and expression in specific muscle fibers, such as slow-twitch and fast-twitch muscles. Myosin heavy chain isoforms play a crucial role in muscle contraction and adaptation to different physiological demands. The exact number can vary between species and muscle types.
When a single neuron sends a strong enough impulse to a muscle that how many muscle fibers does it cause to contract?
When a single neuron sends a strong enough impulse to a muscle, it can cause multiple muscle fibers within that muscle to contract. The specific number of muscle fibers that contract will depend on factors like the size of the motor unit and the intensity of the signal from the neuron.
What are muscle fibers that contains many bundles of cylindrical structure called?
Muscle fibers that contain many bundles of cylindrical structures are called myofibrils. Myofibrils are the contractile units within muscle fibers that are composed of repeating units called sarcomeres. Sarcomeres are responsible for muscle contractions by sliding past each other during the contraction process.
How many muscle fibers stimulate one somatic motor neuron?
150
Skeletal muscle fibers differ from typical cells in that these muscle fibers?
contain multiple nuclei and are elongated, allowing for contraction and relaxation to generate movement in the body. They also have a striated appearance due to the arrangement of myofilaments within the cell, which aids in the sliding filament mechanism of muscle contraction.
What type of muscle is rich in ATP?
Skeletal muscle is rich in ATP as it is the primary energy source for muscle contraction and movement. Skeletal muscle has high energy demands and relies on ATP for fuel during exercise and physical activity.
What are slow twitch muscle fibers?
Our bodies are made up of different types of muscle fibers, all of which rely on different energy systems. Slow twitch fibers, as the name suggests, contract more slowly than fast twitch muscle fibers and they can contract for a longer period of time. We often call these 'endurance' muscles because they're great for aerobic activities that require endurance like running, cycling and swimming. In general, many of us will have about 50% slow twitch fibers and 50% fast twitch fibers, although it will differ between individuals. Successful long-distance runners will often have more slow twitch fibers while sprinters or bodybuilders will often have more fast twitch fibers. Strength training in different rep ranges (from 4-16) will allow you to work different muscle fibers and energy systems in your body.
