UPSC Exam > UPSC Notes > Medical Science Optional Notes for UPSC > Modes of Contraction in Skeletal Muscle
Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC PDF Download
| Table of contents |
|
| Introduction |
|
| Sliding filament Theory |
|
| Isotonic vs Isometric contractions |
|
| Length Tension Relationship In Skeletal Muscle |
|
| Excitation-Contraction coupling |
|
Introduction
As organs that contain cells that can contract, muscles can generate force and movement. Skeletal muscle works in conjunction with the bones of the skeleton to create body movements. Additionally, it is also associated with the diaphragmatic, esophageal, and eye muscles. Thus, skeletal muscle serves a variety of purposes, including moving of the body, breathing, and swallowing. In contrast to both smooth muscle and cardiac muscle, skeletal muscle contracts primarily in response to a voluntary stimulus.
Sliding filament Theory
Isotonic vs Isometric contractions
Isometric Contraction:
- Muscle Length: Does not shorten.
- Force Application: Contracts against a force without changing length (fix length).
- Joint Movement: Does not involve joint movement.
- Tension: Increases, but no work is done (static).
- Energy Efficiency: More energy-efficient with less release of heat.
- Examples:
- Maintaining posture (e.g., standing against gravity).
- Pushing against a wall.
Isotonic Contraction:
- Muscle Length: Shortens.
- Force Application: Shortens against a fixed load.
- Joint Movement: Involves joint movement.
- Tension: Constant during shortening.
- Work Done: Work is done (dynamic).
- Energy Efficiency: Less energy-efficient with more heat release.
- Examples:
- Body movements (e.g., walking).
- Lifting heavy weights.
Additional Notes:
Duration:
- Isometric contractions are often of short duration.
- Isotonic contractions may involve longer durations.
Mechanical Elements:
- Isotonic contractions involve the shortening of contractile elements along with the contribution of elastic and viscous elements.
Question for Modes of Contraction in Skeletal MuscleTry yourself: Which type of muscle contraction involves joint movement and shortening of the muscle?View Solution
Length Tension Relationship In Skeletal Muscle
Excitation-Contraction coupling
Contraction
The document Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC is a part of the UPSC Course Medical Science Optional Notes for UPSC.
All you need of UPSC at this link: UPSC
|
7 videos|219 docs
|
FAQs on Modes of Contraction in Skeletal Muscle - Medical Science Optional Notes for UPSC
| 1. What is the sliding filament theory? |  |
Ans. The sliding filament theory is a theory that explains how muscle contraction occurs. According to this theory, muscle contraction is the result of thin filaments sliding past thick filaments within the muscle fibers. When a muscle contracts, the thin filaments, composed of the protein actin, slide towards the center of the sarcomere, overlapping with the thick filaments, composed of the protein myosin. This sliding action shortens the sarcomere, resulting in muscle contraction.
| 2. What is the difference between isotonic and isometric contractions? | |
Ans. Isotonic contractions are muscle contractions where the muscle changes length, either shortening or lengthening, while exerting force. In isotonic contractions, the tension developed by the muscle remains constant throughout the contraction. Examples of isotonic contractions include lifting weights and walking.
On the other hand, isometric contractions are muscle contractions where the muscle does not change length but generates tension. In isometric contractions, the muscle fibers generate force without any movement in the joints. An example of an isometric contraction is when you try to push against an immovable object, such as a wall.
| 3. What is the length-tension relationship in skeletal muscle? | |
Ans. The length-tension relationship in skeletal muscle refers to how the force generated by a muscle fiber depends on its length. It states that the maximum force is generated when the muscle fiber is at an optimal length. If the muscle fiber is too short or too stretched, the force generated decreases.
When the muscle fiber is at an optimal length, there is maximum overlap between the thin and thick filaments, allowing for the optimal formation of cross-bridges between actin and myosin. This results in the maximum force generation. If the muscle fiber is too short, there is limited overlap, reducing the force generated. If the muscle fiber is too stretched, there is also limited overlap, reducing the force generated.
| 4. How does excitation-contraction coupling occur in skeletal muscle? | |
Ans. Excitation-contraction coupling is the process by which an electrical signal (action potential) is transmitted to the muscle fibers, leading to muscle contraction. It involves the coordinated interaction between the nervous system and the muscle fibers.
When a motor neuron is stimulated, it releases the neurotransmitter acetylcholine at the neuromuscular junction. Acetylcholine binds to receptors on the muscle fiber, causing depolarization of the muscle membrane. This depolarization propagates along the muscle fiber membrane, triggering the release of calcium ions from the sarcoplasmic reticulum.
The released calcium ions bind to troponin, causing a conformational change in the troponin-tropomyosin complex. This exposes the active binding sites on the actin filaments, allowing myosin heads to bind and form cross-bridges. The myosin heads then undergo a series of chemical reactions, resulting in the sliding of the thin filaments past the thick filaments and muscle contraction.
| 5. What are the different modes of contraction in skeletal muscle? | |
Ans. There are two main modes of contraction in skeletal muscle: concentric and eccentric contractions.
Concentric contractions occur when the muscle shortens while generating force. This is commonly seen when lifting a weight or performing a bicep curl. During concentric contractions, the force generated by the muscle is greater than the external load, resulting in muscle shortening.
Eccentric contractions, on the other hand, occur when the muscle lengthens while generating force. This is commonly seen when lowering a weight or lowering oneself down from a pull-up bar. During eccentric contractions, the force generated by the muscle is less than the external load, resulting in controlled muscle lengthening. Eccentric contractions are particularly important for activities such as running downhill or lowering heavy objects, as they help to control and decelerate movement.
Related Exams
About this Document
|
Dec 22, 2024 Last updated |
Document Description: Modes of Contraction in Skeletal Muscle for UPSC 2024 is part of Medical Science Optional Notes for UPSC preparation.
The notes and questions for Modes of Contraction in Skeletal Muscle have been prepared according to the UPSC exam syllabus. Information about Modes of Contraction in Skeletal Muscle covers topics
like Introduction, Sliding filament Theory, Isotonic vs Isometric contractions, Length Tension Relationship In Skeletal Muscle, Excitation-Contraction coupling and Modes of Contraction in Skeletal Muscle Example, for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Modes of Contraction in Skeletal Muscle.
Introduction of Modes of Contraction in Skeletal Muscle in English is available as part of our Medical Science Optional Notes for UPSC
for UPSC & Modes of Contraction in Skeletal Muscle in Hindi for Medical Science Optional Notes for UPSC course.
Download more important topics related with notes, lectures and mock test series for UPSC
Exam by signing up for free. UPSC: Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC
Description
Full syllabus notes, lecture & questions for Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC - UPSC | Plus excerises question with solution to help you revise complete syllabus for Medical Science Optional Notes for UPSC | Best notes, free PDF download
Information about Modes of Contraction in Skeletal Muscle
In this doc you can find the meaning of Modes of Contraction in Skeletal Muscle defined & explained in the simplest way possible. Besides explaining types of
Modes of Contraction in Skeletal Muscle theory, EduRev gives you an ample number of questions to practice Modes of Contraction in Skeletal Muscle tests, examples and also practice UPSC
tests
|
Explore Courses for UPSC exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
Related Searches
Viva Questions
,Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC
,Semester Notes
,past year papers
,Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC
,Free
,mock tests for examination
,ppt
,MCQs
,Sample Paper
,Important questions
,study material
,Exam
,practice quizzes
,Summary
,video lectures
,Objective type Questions
,Previous Year Questions with Solutions
,Modes of Contraction in Skeletal Muscle | Medical Science Optional Notes for UPSC
,Extra Questions
,shortcuts and tricks
;
Additional Information about Modes of Contraction in Skeletal Muscle for UPSC Preparation
Modes of Contraction in Skeletal Muscle Free PDF Download
The Modes of Contraction in Skeletal Muscle is an invaluable resource that delves deep into the core of the UPSC exam.
These study notes are curated by experts and cover all the essential topics and concepts, making your preparation more efficient and effective.
With the help of these notes, you can grasp complex subjects quickly, revise important points easily,
and reinforce your understanding of key concepts. The study notes are presented in a concise and easy-to-understand manner,
allowing you to optimize your learning process. Whether you're looking for best-recommended books, sample papers, study material,
or toppers' notes, this PDF has got you covered. Download the Modes of Contraction in Skeletal Muscle now and kickstart your journey towards success in the UPSC exam.
Importance of Modes of Contraction in Skeletal Muscle
The importance of Modes of Contraction in Skeletal Muscle cannot be overstated, especially for UPSC aspirants.
This document holds the key to success in the UPSC exam.
It offers a detailed understanding of the concept, providing invaluable insights into the topic.
By knowing the concepts well in advance, students can plan their preparation effectively.
Utilize this indispensable guide for a well-rounded preparation and achieve your desired results.
Modes of Contraction in Skeletal Muscle Notes
Modes of Contraction in Skeletal Muscle Notes offer in-depth insights into the specific topic to help you master it with ease.
This comprehensive document covers all aspects related to Modes of Contraction in Skeletal Muscle.
It includes detailed information about the exam syllabus, recommended books, and study materials for a well-rounded preparation.
Practice papers and question papers enable you to assess your progress effectively.
Additionally, the paper analysis provides valuable tips for tackling the exam strategically.
Access to Toppers' notes gives you an edge in understanding complex concepts.
Whether you're a beginner or aiming for advanced proficiency, Modes of Contraction in Skeletal Muscle Notes on EduRev are your ultimate resource for success.
Modes of Contraction in Skeletal Muscle UPSC Questions
The "Modes of Contraction in Skeletal Muscle UPSC Questions" guide is a valuable resource for all aspiring students preparing for the
UPSC exam. It focuses on providing a wide range of practice questions to help students gauge
their understanding of the exam topics. These questions cover the entire syllabus, ensuring comprehensive preparation.
The guide includes previous years' question papers for students to familiarize themselves with the exam's format and difficulty level.
Additionally, it offers subject-specific question banks, allowing students to focus on weak areas and improve their performance.
Study Modes of Contraction in Skeletal Muscle on the App
Students of UPSC can study Modes of Contraction in Skeletal Muscle alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Modes of Contraction in Skeletal Muscle,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Modes of Contraction in Skeletal Muscle is prepared as per the latest UPSC syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup