The Muscular System

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The Muscular System

• By Laura Mills and Chrissy Ophus

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Smooth Muscle

• Iris of the eye
• Bladder walls
• Uterus walls
• Digestive tract
• Artery and vein walls
• Thin layer in the skin

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Smooth Muscle (Con.)

• Also called the involuntary non-striated
• Controlled by the autonomic nervous system or by
  hormones

• Not attached to bones
• Slow acting

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Cardiac Muscle

• Also called Involuntary striated
• Controlled by the autonomic nervous system
• Located only in the heart
• Not connected to bones
• Self stimulating

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Skeletal Muscle

• Also called voluntary striated
• The most abundant tissue in the body
• Averages 40 of the bodies weight
• Connects to the skeleton by tendons

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Skeletal Muscle ( Functions)

• Body movement and function
• Aids in blood movement in large veins
• Heat productions

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Three Types of Muscles

• Cardiac Muscle
• Located in heart, Controlled by autonomic nervous
  system
• Skeletal Muscle
• The most abundant tissue in the body
• Smooth Muscle
• Controlled by autonomic nervous system

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Muscle Contraction

• The sequence of events leading to contraction
• A motor neuron in the ventral horn of the spinal
  cord
• The axon branches to supply a number of muscle
  fibers called a moor unit
• At the motor end plate, the action potential
  causes the release of packets or quanta

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Muscle Contraction (Con.)

• Acetylcholine causes the electrical resting
  potential under the motor end plate to change
• At the opening of each transverse tubule onto the
  muscle fiber surface
• At each point where a transverse tubule touches
  part of the sarcoplasmic reticulum
• The calcium ions result in movement of troponin
  and tropomyosin on their thin filaments