Podcast
Questions and Answers
What is the primary function of the epimysium in skeletal muscle?
What is the primary function of the epimysium in skeletal muscle?
Which structure surrounds bundles of muscle fibers?
Which structure surrounds bundles of muscle fibers?
What contributes to the striated appearance of skeletal muscle?
What contributes to the striated appearance of skeletal muscle?
What is the basic unit of contraction in a myofibril?
What is the basic unit of contraction in a myofibril?
Signup and view all the answers
How does a change in the number of myofibrils affect muscle mass?
How does a change in the number of myofibrils affect muscle mass?
Signup and view all the answers
Study Notes
Skeletal Muscle Structure
- Epimysium: Outer connective tissue layer surrounding the entire muscle, providing shape and a smooth surface for muscle movement.
- Perimysium: Connective tissue that surrounds bundles of muscle fibers, branching within the muscle.
- Endomysium: Connective tissue surrounding individual muscle fibers.
- Muscle Fiber (Muscle Cell): Long, cylindrical fibers within a bundle (fascicle), lying parallel and capable of stretching up to 50cm.
- Myofibril: Cylindrical structures within muscle fibers, exhibiting light and dark bands (striations). These bands are due to the presence of myofilaments.
- Myofilaments: Actin and myosin filaments within myofibrils responsible for muscle contraction.
- Hypertrophy/Atrophy: Increase/decrease in myofibrils leads to muscle growth (hypertrophy) or shrinkage (atrophy).
- Sarcomere: Functional unit of a myofibril; numerous sarcomeres arranged in series, bordered by Z-lines.
- Z-lines: Dark, thick protein bands where actin filaments attach, forming the boundaries of the sarcomere.
- Actin Filament: Thin filaments that interact with myosin for muscle contraction and relaxation.
- Myosin Filament: Thick filaments that interact with actin for muscle contraction and relaxation.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the detailed structure of skeletal muscle in this quiz. Learn about the different connective tissue layers, muscle fibers, and the roles of myofibrils and myofilaments. Test your knowledge on key terms like hypertrophy, atrophy, and sarcomeres.
