Ultrastructure of skeletal muscle
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Skeletal muscle is composed of elongated muscle cells (fibers) that are multinucleated and striated. The fibers are bundled together and surrounded by connective tissue. Each fiber contains myofibrils which are made of sarcomeres, the contractile units of muscle. Sarcomeres contain thick and thin filaments of the proteins myosin and actin which slide past each other during muscle contraction powered by ATP hydrolysis. Skeletal muscle is voluntary, attached to bones by tendons, and able to generate large forces but tires easily due to its structure and reliance on aerobic metabolism.
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This document summarizes the key characteristics of the three main types of muscle: skeletal, smooth, and cardiac. Skeletal muscle is striated and voluntary, attaching to bones to enable movement. Smooth muscle is involuntary and found within organs and blood vessels. Cardiac muscle is striated and autorhythmic, found only in the heart. The document describes similarities and differences in histology, structure, and function between the three muscle types.
MUSCLE TISSUE.ppt
The document summarizes the three main types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle is striated and voluntary, controlling movement. Smooth muscle is involuntary and found in organs. Cardiac muscle is striated like skeletal but contracts rhythmically like smooth. Each type has distinct characteristics at the microscopic level of fibers, nuclei, and junctions. Regeneration capacity is limited in cardiac, moderate in skeletal from satellite cells, and active in smooth tissue.
LT5.2 Muscle Anatomy (Micro & Macro)
The document discusses the three types of muscle tissue in the body: skeletal, cardiac, and smooth muscle. Skeletal muscle is voluntarily controlled and attached to bones, cardiac muscle makes up the heart wall, and smooth muscle controls involuntary functions. Each type has distinct characteristics in terms of structure, location in the body, and control. The document then focuses on skeletal muscle, describing its gross anatomy, microanatomy, and the roles of connective tissue, blood vessels, and nerves.
Topic 5 Muscular System
a compiled resources mainly to facilitate learning outcomes
Identify types of muscle tissues
Describe types of skeletal system
Identify human skeletal system
Identify the component of human musculo-skeletal system
Explain how muscle contracts
Describe muscle and bone relationships
6. MUSCLE TISSUE. MEDICAL studies for pptx
Muscle tissues are categorized into three main types - skeletal, cardiac, and smooth muscle. Skeletal muscle is striated and voluntarily controlled, attaching to bones via tendons. Cardiac muscle is found only in the heart, has intercalated discs, and contracts rhythmically. Smooth muscle lacks striations and has slow, involuntary contractions that allow organs to function. Each muscle type has distinct structural adaptations for its specific physiological roles.
muscle-lecture.pdfbbbbbbbbbbbbbbbbbbbbbb
This document summarizes the key characteristics and functions of the three main types of muscle tissue: skeletal, cardiac, and smooth muscle. It provides detailed information on their structure, including cellular components like myofibrils, sarcomeres, and organelles. The main differences are that skeletal muscle is striated and voluntary, cardiac muscle is striated and involuntary, and smooth muscle lacks striations and is involuntary. Both skeletal and cardiac muscle show cross-striations while smooth muscle does not.
Lect. 8 muscular tissues
Skeletal muscle cells (myocytes) form long, cylindrical, multinucleated fibers that contract to generate movement. Each fiber contains bundled myofibrils composed of actin and myosin filaments. Nerve impulses trigger calcium release from the sarcoplasmic reticulum, allowing myosin heads to attach to actin and generate force as they detach due to ATP hydrolysis, shortening the sarcomere. Muscle relaxation occurs when calcium is resequestered in the sarcoplasmic reticulum, detaching actin and myosin.
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Ultrastructure of skeletal muscle
- 1. Ultrastructure of skeletal muscle NEETHU SIVAN S
- 2. The Muscular System Muscles are responsible for all types of body movement – they contract or shorten and are the machine of the body Three basic muscle types are found in the body Skeletal muscle Cardiac muscle Smooth muscle
- 3. Characteristics of Muscles Muscle cells are elongated (muscle cell = muscle fibber) Contraction of muscles is due to the movement of microfilaments All muscles share some terminology Prefix myo refers to muscle Prefix mys refers to muscle Prefix sarco refers to flesh
- 4. Skeletal Muscle Characteristics Most are attached by tendons to bones Cells are multinucleate Striated – have visible banding Voluntary – subject to conscious control Cells are surrounded and bundled by connective tissue = great force, but tires easily
- 6. • Cells are multinucleate • Nuclei are just beneath the sarcolemma
- 7. Sarcolemma – specialized plasma membrane Sarcoplasmic reticulum – specialized smooth endoplasmic reticulum Myofibril Bundles of myofilaments Myofibrils are aligned to give distinct bands •I band = light band •A band = dark band
- 8. Sarcomere Contractile unit of a muscle fiber Organization of the sarcomere •Thick filaments = myosin filaments •Composed of the protein myosin •Has ATPase enzymes
- 11. Properties of Skeletal Muscle Activity (single cells or fibers) Irritability – ability to receive and respond to a stimulus Contractility – ability to shorten when an adequate stimulus is received
- 12. Questions What is fascicle ? What is muscle cell? What is the function of myofibril? How do the skeletal muscle differ from smooth muscle? What are the characterisitcs of heart muscle? Explain briefly the structure of skeletal muscle?
- 13. Home work Prepare a note on the structure of the skeletal muscle in your diary Prepare a chart on the structure of skeletal muscle