How calcium ions contribute in the muscle contraction
How do calcium ions contribute in the muscle contraction? Why do both muscle relaxation and muscle contraction spend energy?
Expert
In muscle cells, calcium ions are stored in the sarcoplasmic reticulum. Whenever a motor neuron emits stimulus for muscle contraction neurotransmitters termed as acetylcholine are liberated in the neuromuscular junction and sarcolemma is excited. The excitation is conduced to sarcoplasmic reticulum which then liberates calcium ions into the sarcomeres.
In sarcomeres, the calcium ions join to troponin molecules related to actin activating myosin joining sites of actin. The myosin, then capable to join to actin, pulls this protein and sarcomere shortens. The summation of simultaneous contraction of sarcomeres and myofibrils comprises the muscle contraction. Throughout muscle relaxation, the calcium ions return back to sarcoplasmic reticulum. For myosin to join to actin, and therefore for the contraction to take place, hydrolysis of one ATP molecule is essential. Throughout relaxation, the return of calcium ions to the sarcoplasmic reticulum is an active procedure which spends ATP too. Therefore both muscle contraction and relaxation are energy-spending procedures.
Describe crystallization of a virus? What is the significance of this procedure?
Although personality tends to be consistent and enduring, it may still change under certain circumstances. For instance, an individual's personality may be altered by major life events, such as the birth of a child, the death of a loved one, a divorce, or a major career promotion.
Explain the significance of the lignin for the formation of xylem ?
Why maternal milk is so important for the immune protection of the baby?
Characteristics of Bureaucracy A bureaucratic organization shows the following characteristics: (1)
Write the evolutionary advantage of the occurrence of sperm cells and larval phase in the life cycle of sponges?
I have a problem regarding decision tree. Answer the following question. The decision tree is as shown, perform the tasks listed below: Q : How are artificial and natural pearls How are artificial and natural pearls made?
How are artificial and natural pearls made?
Define the term digestion? Answer: Digestion is the breaking down of bigger organic molecules received from the diet, example, carbohydrates, proteins, fats, into sm
What is the chorioallantois membrane existed in the embryonic growth of reptiles and birds? How does this membrane contribute in the energetic metabolism of the embryo?
18,76,764
1940174 Asked
3,689
Active Tutors
1418278
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!