Muscle & Nervous Tissue

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Muscle & Nervous Tissue
OBJECTIVES:
1. Differentiate between the 3 types of
muscle tissue.
2. Be able to identify muscle tissues by
sight.
3. Anatomy of a neuron
4. Different method of tissue repair
Muscle Tissue
 Highly specialized to contract/shorten to
produce movement.
 3 Types:



Skeletal
Cardiac
Smooth
1. Skeletal Muscle
 Attached to the skeleton
 Can be controlled
voluntarily
 Causes gross body
movements
 Cells of muscle tissue are
long, cylindrical, have
many nuclei, and are
striated (striped).
2. Cardiac Muscle
 Found only in the heart.
 Is striated
 Cells fit tight together at
junctions called
intercalated disks.
Intercalated disks contain
gap junctions that allow
impulses to travel.
 Involuntary control.
3. Smooth Muscle
 No visible striations.
 Cells have a single nucleus and are
spindle shaped.
 Found in walls of hollow organs
(stomach, bladder, uterus)
 Can contract (making organ smaller)
or enlarge (making organ dilate) to
move substances along.
 Peristalsis: moving food through
the esophagus.
Nervous Tissue
 Found in the brain, spinal cord, & nerves
 Specialized to react to stimuli and conduct
impulses.
 Made up of cells called neurons.
Tissue Repair
 Tissues repair themselves in 2 major ways.
 Regeneration: the replacement of destroyed
tissue by the same kind of cells.
 Fibrosis: involves repair by dense
connective tissue forming scar tissue.
 The type of repair chosen depends on the type of
tissue damaged and the severity of the injury.
 Clean cuts heal much more easily and quickly than
rips or tears.
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