0
When muscle fibers are stimulated to contract what is occur ing?
Wiki User
∙ 11y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Before a muscle cell can be stimulated to contract again what must occur?
Repolarization
What changes are thought to occur in the skeletal muscle to allow treppe to be observed?
This is known as wave summation. It is when the fibers of the muscles become stimulated before having a chance to relax completely.
Irregular transverse thickenings of the sarcolemma?
Irregular transverse thickenings of the sarcolemma connect cardiac muscle fibers to neighboring muscle fibers. The gap junctions that occur with irregular transverse thickening of the sarcolemma allow the myocardium to contract as a single unit.
What is maximal tetanic tension?
When a muscle is applying a little bit of force, action potentials are triggering twitches in the muscle fibers. A skeletal muscle has many many muscle fibers, and a single fiber (cell) is either contracted or relaxed, it cannot get stronger or apply a fraction of its force. A muscle fiber and its connected neuron are called a motor unit When a muscle is applying a lot of force it is sending many action potentials at once, such that most of the fibers in a muscle are contracting at once. This effect is called motor unit recruitment When a muscle is "maxing out," it is sending waves of many action potentials in rapid succession, such that the whole muscle is stimulated again while the stimulated cells are still in the relaxing phase. This has the effect of not only reactivating the fibers in the relaxing phase, but also engaging more of the few cells that were left so that more total fibers contract. When the signals are received in rapid enough succession the total force of the muscle will eventually plateau. This is called unfused tetanus. If applied at an even greater frequency the fibers that are activated will stay activated so that no lag is seen between single fiber twitches. It is at this point that the fibers are all fused and the muscle has reached maximum tetanic tension (This can occur as an effect in patients with tetanus, hence the name)
Why is it important that summation not occur in heart muscle?
Basic muscle summation -an increase in the frequency with which a muscle is stimulated increases the strength of contraction. With increased stimuli to the heart if summation occurred the contractions would keep increasing.
How does a joint move a bone?
Muscles are made up by thousands of fibbers that can contractAs muscles contract then relax they move the bones and limbs at the jointMuscles also work in pairsWhen one muscle contract the other muscle controls the opposite action will need to relaxMuscles are made up by thousands of fibers that can contactAs muscles contact then relax they move the bones and limbs at the jointMuscles also work in pairsWhen one muscle contract the other muscle controls the opposite action will need to relax
What are the tree kinds of muscle tissues?
The 3 types of muscle tissue are cardiac, smooth, and skeletal.Cardiac muscle cells are located in the walls of the heart, appear striated, and are under involuntary control.Smooth muscle fibers are located in walls of hollow visceral organs, except the heart, appear spindle-shaped, and are also under involuntary control.Skeletal muscle fibers occur in muscles which are attached to the skeleton. They are striated in appearance and are under voluntary control.
Does stretch marks occur from breaks in the collagen fibers?
Yes.
What happens for micturition to occur?
1) The detrusor muscle must contract 2) The internal urethral sphincter must open 3)The external urethral sphincter must open
Three types of muscle and give an example for them?
Cardiac, skeletal, and smooth muscles.the three types of muscle in the body: cardiac (heart), skeletal (biceps, quadriceps etc.), and smooth muscle (found in the intestinal tract such as stomach and colon).
When does true synergy occur in relation to muscular contractions?
True synergy is when a muscle that crosses two joints is restricted at one joint by another muscle. There are are two types of synergy:Helping synergy is when two muscles contract simultaneously to produce one movement.True synergy is when a different muscle contracts to stop the secondary action of another muscle.
Is a license a legal contract?
Yes. Terms in the contract dictate which sanctions will occur if the contract is broken.
