What determines the strength of a muscle in response to different levels of stimulation?

Answer 1

the best way to think of this is using complete common sense or else you can cloud a simple concept and make it seem very difficult.

If you have a muscle fiber that if already as short as it can be, then when it contracts, the actin and myosin filaments will run out of room to contract farther and therefore you will have a very weak contraction.

If on the other hand your muscle fiber is stretched a lot before the contraction, you will have pulled the actin and myosin filaments apart, so that they no longer overlap. agin, this will produce a very weak contraction.

But, if your filaments are overlapped appropriately, then you have plenty of room for the fibers to shorten, and you get a good contraction.

The power of the contraction curve is a bell curve where you stark at zero power (at the shortest) then it peaks and drops again as the filaments are pulled too far apart.

The situation becomes more complicated when you add the effects of passive stretch, but that was not the original question, so I'll leave it at that.

Answer 2

A skeletal muscle contraction refers to the ways wherein the muscles of the body's movable joints produce movements. The degree of muscle stretch affects the strength or force or skeletal muscle contraction.

Answer 3

1. Physiological cross section (number of fibers)
2. Number of motor units
3. Frequency of motor unit activation
4. Muscle length
5. Contraction velocity (shortening)

Answer 4

The strength of a muscle contraction depends on the amount of motor units that are working. If more strength is required, more motor units will be triggered to work.

Answer 5

Well, it is based on the Surface of the bone. The more you work out the smoother the bone gets.

Answer 6

Motor units recruited, frequency of the stimulation and type of the muscle

Answer 7

The number of motor units stimulated.