Cardiac

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Cardiac Smooth Muscle

• By Daniel Dierfeldt
• Molecular Biology

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Cardiac Muscle

• Involuntary and striated muscle
• Cardiocyte Muscle Cell of the Heart
• Short, thick, branched cells
• Each cell has only 1 nucleus

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Cardiac Muscle

• 10-20µm in diameter
• 50-100µm in length
• Each Cell joined by Intercalated Disks.
• No Neuromuscular Junctions

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Cardiac Muscle

• Contain Large Mitochondria
• Proteins of Cardiac Muscle are similar to
  Skeletal Muscle
• Mechanism of Contraction similar to Skeletal
  Muscle
• Fatigue Resistant

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Smooth Muscle

• Long, spindle-shaped cells
• No Striations or Sarcomeres
• No Neuromuscular Junctions
• No Motor Nerves

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Smooth Muscle

• No Troponin Complex
• Calmodulin shuttles Calcium into the Cell.
• Mechanism of Contraction differs from Skeletal
  and Cardiac Muscle.
• Interaction of Myosin with Actin same as in
  Skeletal and Cardiac Muscle.

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Smooth Muscle

• Encircle blood vessels and other hollow tubes of
  the body.
• Also found lining the stomach, bladder, and
  uterus.

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Bibliography

• www.cvphysiology.com/Blood20Pressure/BP026.htm
• www.udel.edu
• virtual.yosemite.cc.ca.us
• www.mastersmensclinic.com
• learninglab.co.uk
• education.vetmed.vt.edu
• www.jdaross.cwc.net
• Pasternak, Jack J. 2nd ed. Hoboken, New Jersey
  John Wiley Sons, 2005. 373.