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THE MUSCULAR SYSTEM

THE MUSCULAR SYSTEM. Muscle types Sliding Filament Theory Types of contraction Anatomy diagram. Introduction . Our bodies have over 600 muscles, which make up half of our body weight Muscles are used to eat, talk, walk etc

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THE MUSCULAR SYSTEM

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  1. THE MUSCULAR SYSTEM Muscle typesSliding Filament TheoryTypes of contractionAnatomy diagram

  2. Introduction • Our bodies have over 600 muscles, which make up half of our body weight • Muscles are used to eat, talk, walk etc • Muscles burn lots of calories when they are being used and when resting • Muscles burn even more calories when they are “in shape”

  3. MAJOR MUSCLE TYPES SMOOTH MUSCLE: • Involuntary and contract automatically • CNS adjusts contraction as required • They do not tire easily and can stay contracted for long periods of time Ex. Esophagus, stomach, blood vessels

  4. MAJOR MUSCLE TYPES CARDIAC MUSCLE • Specialized muscle tissue that comprises the heart • Involuntary • Striated

  5. MAJOR MUSCLE TYPES SKELETAL MUSCLES: • Connect to bones by tendons • Voluntary – you control them • Most prevalent in human body –> 30-40% of human weight • Striated (striped appearance) • The engines that pull on bones – causing joints to move

  6. MUSCLES IN ACTION… Muscles work through a process called contraction. Muscle Contraction – result of filaments deep within the muscle sliding over each other This process occurs simultaneously over entire muscle fibre – resulting in contraction

  7. SLIDING FILAMENT THEORY Sequence for contraction: • Electrical impulse comes from brain (voluntary) or spinal cord (involuntary) • Signal travels along never to muscle site (neuromuscular junction) and attempts to jump the gap.

  8. SLIDING FILAMENT THEORY • Chemical reaction takes place deep within the muscle fibre • The reaction causes the filaments to “slide” over one another. Thin filament (actin) slide past the thick filament (myosin) • Muscle fibre contracts. http://www.youtube.com/watch?v=EdHzKYDxrKc

  9. Types of Muscle Contraction • CONCENTRIC – muscle shortens while working • ECCENTRIC – muscle lengthens while working • ISOMETRIC – no change in length. Force = resistance.

  10. Skeletal Musculature • Origin of a muscle is located at the proximal end (toward the center of the body) • Insertion of a muscle is located at the distal end (away from the center of the body) • The muscle most directly involved in brining about a movement is call the agonsit • A muscle that can slow down or stop the movement is called the antagonist

  11. ANATOMY DIAGRAM • Complete the chart and diagram

  12. Insertion and Origin • Complete the chart along with the website www.

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