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.
How many are the recognized amino acids which form proteins in the living beings?
Explain the term nutrient in brief? Answer: The nutrient is a substance which is employed in the metabolism and that is acquired from the diet. For illustration, vit
What is the vector of the malaria disease? How different is its behavior from behavior of vector of the dengue fever?
Describe the anatomical reason for the left bronchus to be much elevated than the right bronchus? Why in many cases of aspiration of foreign material through children is the object found in the right bronchus?
Give an illustration of a situation in which the neuron cell body is positioned in a part of the body and its axonal terminal part is in another distant portion of the body? Why does this take place?
Classify the excretory system of molluscs?
What do you mean by the term ureotelism? Briefly describe it.
Prepare a 4-5 page report addressing the following: A) Discuss the type of product the company will offer and identify its primary characteristics.B) Discuss the product branding strategy.C) Discuss how the product fits
Write down the physiological systems which are known as integrative systems? Why this designation justified?
On average write down the life duration of red blood cells? Where are they destroyed? What is the destination of heme groups after destruction of hemoglobin molecules?
18,76,764
1938629 Asked
3,689
Active Tutors
1433803
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!