Contraction Of a Muscle

PAPER INSTRUCTION FROM CUSTOMER

Assignment topic: Contraction Of a Muscle

Number of Pages: 3 pages / 825 words

Format: APA

ESSAY WRITTEN SOLUTION

View Sample Solution Pdf

The sliding theory of Muscle Contraction

Animals are made of a skeletal system that has various functions, among them stimulating movement in animals. In the process of movement, the muscles attached to the skeletal system are also useful since it is their contraction and relaxation that causes movement. The process of muscle contraction starts with the motor neuron sending a signal, mainly the neurotransmitter, thus causing fiber innervation. As a result, there would be depolarization of the local membrane of the fiber that would further make positively charged sodium ions to get in and trigger an action potential that will then spread to the whole membrane, thus making it depolarized (Shiffman, 2011). The T-tubules will also be with be depolarized in the process. As a result, the sarcoplasmic reticulum will be triggered to produce the stored calcium ions, which then initiate the process of contraction that is maintained by adenosine triphosphate. The muscle is bound to contract to the shortest possible anatomical limit if troponin has been bonded by calcium ions that have remained in the sarcoplasm. Troponin is responsible for un-shielding active binding sites. Besides, adenosine triphosphate should be in place to facilitate cross-bridge cycling and ensuring that myosin is pulling actin strands.

During the process of muscle contraction, the neuromuscular junction plays a significant role in creating contact between muscle fiber and a motor neuron. The motor neuron is mainly charged with facilitating movement through impulse delivery. It is at the myoneural junction that then the motor neuron can easily transit a signal to the muscles that will then trigger muscle contraction (Shiffman, 2011). Each motor neuron is connected to muscle fiber and has its cell body at the central nervous system and have axons and axon terminals at the further end that then penetrate the perimysium of the muscle. The synaptic end bulb refers to the tip of the axon near the muscles that has enlarged in size and mainly constitutes the nervous system components at the myoneural junction (Shiffman, 2011). The motor endplate, on the other hand, is the muscular component of the muscle fiber. The synaptic cleft, on the other hand, is useful in ensuring that action potential coming from the nervous system at the neuromuscular junction is transverse mainly by ensuring the electrical signals that are turned chemical so that they can easily pass by the synaptic cleft. The mitochondria are the essential organelles found within the muscle cells in numbers to ensure the production of metabolic energy for muscle contraction (Shiffman, 2011). Besides, the endoplasmic reticulum also acts to assist the mitochondria in maintaining homeostasis and filtering molecules to enhance the function of the mitochondria.

The sliding filament theory is a submission that seeks to explain the process of muscle contraction by mainly analyzing the behavior of the actin filaments, sarcomere, and the myosin filaments. Using high-resolution microscopy, it was established that during the process of contraction, a part of the sarcomeres remain constant while the other reduced in length. The muscle is made up of striations of essential muscle elements that are referred to as sarcomeres, which are mainly arranged in a stacked pattern in muscle tissues (Shiffman, 2011). The sarcomeres are made up of proteins that can change in length, thus causing a change in muscle length. The sarcomeres contain actin and myosin filaments whose interaction causes a change in length of the sarcomeres and further the muscle, thus the sliding filament theory (Squire, 2016). The theory explains that during a process of muscle contraction, thick myosin filaments remain centrally constant and do not change in length while the actin filaments thin in nature changed shortened in length together with the sarcomere. The movement of the actin filaments is always referred to as a power stroke. A cross-bridge which is necessary for the process is formed when the myosin-binding site is exposed by the tropomyosin on an actin filament (Squire, 2016). As a result, the sliding filament theory was described as the sliding effect between the actin and myosin filaments with further causes muscle contraction.  The theory explains that sarcomeres change in length together with the actin filaments since the actin filaments are connected to the lateral ends of the sarcomeres; thus, the change in length of the actin filaments would also cause a resultant change within the sarcomeres.

The process of muscle relaxation begins with the action of the motor neuron not releasing its chemical signal to the neuromuscular junction. The process will eventually also lead to a relaxation of the skeletal system. As a result, the muscle fibers will automatically repolarize, thus inhibiting the production of calcium ions by the sarcoplasmic reticulum. Further, the actin-binding sites that are mainly found on the thin filaments within the sarcomere will have to re-shield (Squire, 2016). As a result, the thick and the thin filaments would have it impossible to form cross-bridges, thus loss

References

Shiffman, C. (2011). Electrical impedance changes during muscle contraction. Muscle & Nerve, n/a-n/a. https://doi.org/10.1002/mus.22148

Squire, J. (2016). Muscle contraction: Sliding filament history, sarcomere dynamics and the two Huxleys. Global Cardiology Science And Practice, 2016(2). https://doi.org/10.21542/gcsp.2016.11

View Sample Solution Pdf

Kindly read the attached sample solution pdf above and place an order if you would like to hire our expert writers to work on any of your tasks. We provide plagiarism free content that meets all the academic writing requirements while adhering to the set deadline. Thank you🥰

Order a unique copy of this paper
(550 words)

Approximate price: $22

Place Order
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

We value our customers and so we ensure that what we do is 100% original..
With us you are guaranteed of quality work done by our qualified experts.Your information and everything that you do with us is kept completely confidential.

Zero-plagiarism guarantee

The Product ordered is guaranteed to be original. Orders are checked by the most advanced anti-plagiarism software in the market to assure that the Product is 100% original. The Company has a zero tolerance policy for plagiarism.

Read more

Free-revision policy

The Free Revision policy is a courtesy service that the Company provides to help ensure Customer’s total satisfaction with the completed Order. To receive free revision the Company requires that the Customer provide the request within fourteen (14) days from the first completion date and within a period of thirty (30) days for dissertations.

Read more

Privacy policy

The Company is committed to protect the privacy of the Customer and it will never resell or share any of Customer’s personal information, including credit card data, with any third party. All the online transactions are processed through the secure and reliable online payment systems.

Read more

Fair-cooperation guarantee

By placing an order with us, you agree to the service we provide. We will endear to do all that it takes to deliver a comprehensive paper as per your requirements. We also count on your cooperation to ensure that we deliver on this mandate.

Read more

Calculate the price

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
× WhatsApp us for help