Muscular
System- Part 1
Unit 5
Miss Wheeler
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Muscles and Muscle Contraction: Anatomy and Function, Slides of Biology
An overview of the muscular system, focusing on the functions and characteristics of muscles. It covers the three types of muscles - smooth, cardiac, and skeletal - and their respective properties. The text also explains the structure of skeletal muscles, including the role of myofibrils, myofilaments, and the sliding filament theory.
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2021/2022
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Muscular
System- Part 1
Unit 5 Miss Wheeler
Fun Facts!
ย๏ The tongue is the strongest muscle in your body ย๏ The smallest muscles in the body are in the middle ear ย๏ The largest muscle in the body is the gluteus maximus ย๏ It takes 17 muscles to smile, and 43 muscles to frown ย๏ The heart is the only muscle that never gets tired
Characteristics of Muscles
ย๏ Muscle cells (called muscle fibers) are elongated ย๏ All muscles share some terminology: ย๏ Myo - muscle ย๏ Mys - muscle ย๏ Sarco โ flesh ย๏ Epi- upon ย๏ Peri- around ย๏ Endo- inner
Muscle Tissue
ย๏ Three muscle types (you already know these):
- Smooth Muscle
- Cardiac Muscle
- Skeletal Muscle
Cardiac Muscle
ย๏ Makes your heart beat ย๏ Striations ย๏ Single nucleus ย๏ Involuntary ย๏ Cells jointed to each other at intercalated discs ย๏ Found only in the heart
Skeletal Muscle
ย๏ Moves your bones ย๏ Striated ย๏ Multi-nucleated ย๏ Voluntary ย๏ Cells are surrounded and bundled by connective tissue ย๏ Most are attached to bones by tendons
Try This!
A. Smooth B. Cardiac C. Skeletal ______________ involuntary ______________ striated ______________ moves bones ______________ voluntary ______________ this picture ร ๏
Structures of Skeletal Muscle
ย๏ Epimysium- covers the entire skeletal muscle ย๏ Perimysium- covers a bundle of fibers ( fascicle ) ย๏ Endomysium- covers a single muscle fiber (cell)
Structure of Skeletal Muscle
Structure of Skeletal Muscle
ย๏ Myofibrils are made of myofilaments that form a unit called a sarcomere with light and dark bands. ACTIN = thin filaments; form light band (I band) MYOSIN = thick filaments; form dark band (A band)
Try This! Muscle
composed of Individual types composed of composed of bundles cells filaments light^ dark composed of fibrils
Twizzler Analogy
Many packages of Twizzlers together = fascicle Find a fascicle on your diagram
Twizzler Analogy
1 bundle of Twizzlers = 1 Twizzler strand =