0
What else can I help you with?
Howdo muscles move in your body?
Muscles make possible every move we make, even when we are sleeping. Your muscles move according to what they are fromed. To be more specific, a muscle is made up of many bundles of muscle fibers. Each of these bundles of fibers is called a motor unit. Each unit has a motor nerve which branches out at its tip. Each muscle fiber, therefore, has its own nerve ending to stimulate it. An electrochemical impulse is transmitted by chemicals from the nerve ending to the fiber, causing the fiber in that motor unit to contract and this is how each muscle of your body moves.
What does contraction mean in medical terms?
contract or "contraction" is when a muscle fiber lengthens or shortens
Molecules pass in and out of the sarcoplasmic reticulum as a muscle fiber contracts and releases?
calcium Ca2+
What is the phenomenon which muscle fiber contracts to its fullest extent or not at all?
All-or-none response.
What shortens contraction?
The interaction between actin and myosin filaments in muscle cells shortens the sarcomere during a contraction. Calcium ions released from the sarcoplasmic reticulum trigger this interaction, leading to the sliding of actin filaments over myosin filaments and shortening of the muscle fiber.
When a muscle fiber is subjected to a stimulus it contracts completely is called?
When a muscle fiber is subjected to a stimulus and contracts completely, this phenomenon is known as the "all-or-nothing response." In this response, if the stimulus reaches a certain threshold, the muscle fiber will contract fully; if it does not reach this threshold, there will be no contraction. This principle applies to individual muscle fibers, while whole muscles can exhibit varying degrees of contraction based on the number of fibers activated.
How does the sarcomere contract?
The sarcomere contracts through the sliding filament model, where actin (thin filaments) and myosin (thick filaments) interact. During contraction, myosin heads bind to actin, forming cross-bridges and pulling the actin filaments inward, which shortens the sarcomere. This process is powered by ATP, which provides the energy needed for myosin to detach and reattach to actin, allowing for repeated cycles of contraction. Consequently, the entire muscle fiber shortens, leading to muscle contraction.
As one muscle contracts the must relax.?
Yes. If not, the action at the joint will be incomplete and dysfunctional. As a whole, a muscle fiber is either contracted or relaxed (the all-or-none principal).
How fast does a muscle contract?
The fastest a muscle fiber can contract is 0.01 seconds or less. However, this is not necessarily the speed that the actual muscle contracts at. For example, the human eyelid can only blink in 0.15 seconds.
What is the all or none principle in weight training?
The "All or None" principle in weight training is that a muscle fiber contracts completely, or not at all.
Why do muscles bulged when they contract?
Skeletal muscle tissue is made of many fibers, which have many sarcomeres with overlapping actin and myosin protein strands. When muscles contract their proteins overlap eachother and shorten the fiber, which then increases height but shortens in length of each fiber.
When a muscle fiber contracts the you bands diminish in size the h zones disappear and the a bands move closer together but do not diminish in length true or false?
True
