Cardiac Smooth Muscle By Daniel Dierfeldt Molecular Biology

Cardiac & Smooth Muscle By: Daniel Dierfeldt Molecular Biology

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

Cardiac Muscle § ~10 -20μm in diameter § ~50 -100μm in length § Each Cell joined by Intercalated Disks. § No Neuromuscular Junctions

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

Smooth Muscle § Long, spindleshaped cells § No Striations or Sarcomeres § No Neuromuscular Junctions § No Motor Nerves

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.

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

Bibliography § www. cvphysiology. com/Blood%20 Pressure/ BP 026. 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. 2 nd ed. Hoboken, New Jersey: John Wiley & Sons, 2005. 373.