If muscle fiber concentration is all-or-none, how is graded muscular activity possible?

Expert Solution

Answer :)

The muscular activity depends upon the action potential. If a particular action potential crosses, threshold voltage, the muscle contraction occurs. This is all condition. If it does not cross the threshold, there will be no contraction. This is none condition irrespective of how strong stimulus is.

However, graded muscle activity depends upon the strength of the stimulus. There are two graded responses. In wave summation, a strong twitch follows by a weaker incomplete twitch. Therefore, continuous stronger twitches make the wavy contractions. Other is tetanus in which if stimulus frequency is quick but having a relaxation phase, produces incomplete tetanus. If stimulus frequency is so high that the relaxation phase is disappeared, it produces complete tetanus.

Therefore, in graded muscles, the action potential should cross the threshold and then it will call as the all condition of all or none law.

Sydney Mullin answered 3 months ago

a muscle fibre twitch is abrupt or all or none. a muscle contraction is smooth and...

a muscle fibre twitch is abrupt or all or none. a muscle contraction is smooth and graded. explain why

for the biceps and triceps muscle How is the mechanical behavior of a single muscle fiber...

for the biceps and triceps muscle How is the mechanical behavior of a single muscle fiber in tension different from the whole muscle? What is the functional value?

A _______ consists of a motor nerve fiber and all the muscle fibers it atimulates at...

A _______ consists of a motor nerve fiber and all the muscle fibers it atimulates at neuromuscular joints

Explain how acid accumulation in a muscle fiber could contribute to fatigue.

explain how a ray of light can guide inside of a graded-index fiber optic, and compare...

explain how a ray of light can guide inside of a graded-index fiber optic, and compare and contrast this with how a light ray is guided inside of a step-index fiber

You are receiving an intra-muscular vaccination in your right deltoid muscle. Examine how the cardiovascular and...

You are receiving an intra-muscular vaccination in your right deltoid muscle. Examine how the cardiovascular and lymphatic systems participate in host immune defenses through responding to the following with a post of at least 300 words. Describe the anatomical locations of major organs in the cardiovascular and lymphatic systems. Differentiate how blood flow is different from lymph flow. Describe the homeostatic mechanisms that create a microbiota free environment in blood and lymph. Trace the path of the vaccine through the...

1. Based on information related to muscle fiber differentiation, briefly describe how a mutation that disrupts...

1. Based on information related to muscle fiber differentiation, briefly describe how a mutation that disrupts the synthesis of myostatin by satellite cells could produce the following phenotype (i.e. a dog with lots of muscle). 2. Based on your understanding of melanocyte differentiation, briefly describe how a mutation that increases the synthesis of a protein that competes with MSH could produce the following phenotype (i.e. a dog lacking dark pigment).

Question

If muscle fiber concentration is all-or-none, how is graded muscular activity possible?

Solutions

Expert Solution

Related Solutions