MUSCLE TISSUE

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MUSCLE TISSUE
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MUSCLE TISSUE

• Specialized for contraction to produce movement.
  Muscle cells are elongated and called muscle
  fibers.
• 3 Types 1. Skeletal
• 2. Cardiac
• 3. Smooth

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MUSCLE TISSUE

• SKELETAL MUSCLE
• TISSUE- packaged in long strands
• STRIATIONS- alternating light and dark bands-
  formed by the internal arrangement of the protein
  fibers
• multinucleate
• Voluntary contractions

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MUSCLE TISSUE

• SMOOTH MUSCLE (visceral) TISSUE- forms the walls
  of the blood vessels and other visceral organs-
  stomach, bladder, uterus, large intestine, etc.
• -No striations-
• Smooth muscle contracts slowly-
• PERISTALSIS- alternating of contractions in a
  wavelike motion that keeps food moving through
  the small intestine, etc.

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MUSCLE TISSUE

• CARDIAC MUSCLE- has striations but only one
  nucleus per fiber.
• Contains junctions called intercalated disks-
  allows ions to pass freely from cell to cell
  resulting in rapid contractions

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NERVOUS TISSUE

• NERVE TISSUE- (neurons) have well-developed
  properties of conductivity and irritability.
• - Sends and carries electrochemical signals
  throughout the body. - Nerve cells can be as
  long as 3 feet.
• - have a fatty covering called a MYELIN SHEATH
• - 2 types of nerve tissue
• 1. NEURON (or nerve cell)
• 2. NEUROGLIA

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NERVOUS TISSUE

• 3 parts of the NEURON
• 1. CELL BODY
• 2. DENDRITES
• 3. AXONS

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NERVOUS TISSUE

• CELL BODY- center of the neuron, contains the
  nucleus as well as other organelles
• DENDRITES- receive signals and direct them
  towards the cell body
• AXONS- sends signals away from the cell body to
  other parts of the body (brain or muscles)

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NERVOUS TISSUE

• NEUROGLIA- make up 90 of the substance of the
  brain and spinal cord.
• Produce the MYELIN SHEATH
• Remove unwanted materials via phagocytosis
• Aid in the movement of cerebrospinal fluid