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.
Trait Studies-Theories of Leadership: A) The "great man" approach B) Traits are distinguishing personal characteristics of a leader such as intelligence, values, appearance, etc
Give a brief explanation of catalysts?
What are the various problems that vertebrates required to resolve to adapt to the terrestrial atmosphere as they came from aquatic habitat? How evolution does solve such problems?
Generally, which phase of the menstrual cycle during the copulation may lead to fecundation?
Into how many kinds is immuno fluorescence is classified?
Write down the respective functions of separation of homologous chromosomes and of separation of identical chromatids in the meiosis?
How different are the concepts of the resting potential, action potential and excitation threshold concerning neurons?
Explain that what type of defense cell make bacteria attract and origin to multiply in the inflammation process? Specified the name given to the waste material made by the inflammation activated by bacterial infection?
Line and staff authority According to the authority approach which is more relevant in analyzing the problem of line and staff relationships, line and staff are two
Which organs is part of musculoskeletal system?
18,76,764
1943432 Asked
3,689
Active Tutors
1415204
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!