Quick Answer: Why Relaxation Period Is Longer Than Contraction Period?

What is the contraction period?

The contraction period represents the time during actual muscle contraction.

The relaxation period is the time during which Ca 2+ are returned to the sarcoplasmic reticulum by active transport.

The refractory period is the time immediately following a stimulus..

What is latent period quizlet?

Latent period is the period of time between the generation of an action potential in a muscle cell and the start of muscle contraction. Describe the process of excitation-contraction coupling in skeletal muscles fibers.

Why is there a latent period for muscle contraction?

The first phase is the latent period, during which the action potential is being propagated along the sarcolemma and Ca++ ions are released from the sarcoplasmic reticulum. This is the phase during which excitation and contraction are being coupled but contraction has yet to occur.

What is meant by contraction and relaxation?

Muscle contraction is the activation of tension-generating sites within muscle fibers. … The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state. Muscle contractions can be described based on two variables: length and tension.

Does the latent period change with different stimulus?

Latent period is the time preparing for contraction. Contraction is when muscle tension peaks. The relaxation period is at the end of muscle contraction. The latent period did not change with changes in stimulus voltage.

How do the tracings change as the stimulus rate is increased?

When the stimulation rate is changed by 10 stimuli/sec up to 150 stimuli/sec, how do the tracings change? The active force produced by the muscles stays the same. The active force produced by the muscles decreases. The tracings become smoother.

In which condition are stimuli are so frequent that the muscle Cannot relax?

Fused tetanus is when there is no relaxation of the muscle fibers between stimuli and it occurs during a high rate of stimulation. A fused tetanic contraction is the strongest single-unit twitch in contraction.

What is threshold stimulus?

The minimum stimulus needed to achieve an action potential is called the threshold stimulus. The threshold stimulus causes the membrane potential to become less negative (because a stimulus, no matter how small, causes a few sodium channels to open and allows some positively-charged sodium ions to diffuse in).

Which type of contraction generates the greatest force?

concentric contractionA concentric contraction is a type of muscle activation that causes tension on your muscle as it shortens. As your muscle shortens, it generates enough force to move an object. This is the most popular type of muscle contraction. In weight training, a bicep curl is an easy-to-recognize concentric movement.

What is happening in the muscle when a stimulus finally reaches threshold?

Muscle Stimulus and Contraction Strength A skeletal muscle fiber will produce a given amount of force if the stimulus is strong enough to reach the threshold for muscle contraction.

Which type of contractions generates the least force?

In a concentric contraction, the force generated by the muscle is less than the muscle’s maximum, and the muscle begins to shorten. This type of contraction is widely known as muscle contraction. It requires more energy compared to the other two types, but this contraction generates the least force.

What is responsible for causing muscle contractions?

1. A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles. Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron.

What are the 4 types of muscle contractions?

Isometric: A muscular contraction in which the length of the muscle does not change. isotonic: A muscular contraction in which the length of the muscle changes. eccentric: An isotonic contraction where the muscle lengthens. concentric: An isotonic contraction where the muscle shortens.

What is the latent period?

Latent period (epidemiology), the time interval between when an individual is infected by a pathogen and when he or she becomes capable of infecting other susceptible individuals.

Why is it advantageous to have a highly folded Sarcolemma at the motor end plate?

The motor end plate possesses junctional folds—folds in the sarcolemma that create a large surface area for the neurotransmitter to bind to receptors. The receptors are actually sodium channels that open to allow the passage of Na+ into the cell when they receive neurotransmitter signal.