muscle_tissue.ppt mussscle tissue pharmacology

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1. Muscle TissueMuscle Tissue
There are 3 types of muscle tissue:There are 3 types of muscle tissue:
 skeletalskeletal
 smoothsmooth
 cardiaccardiac

2. Classification of Muscle CellsClassification of Muscle Cells
Striated vs. Nonstriated Striated vs. Nonstriated
striated have a banded appearance (stripes)striated have a banded appearance (stripes)
Single nucleus or multinucleated cellsSingle nucleus or multinucleated cells
Muscle cells can be controlled Muscle cells can be controlled
voluntarily (consciously)voluntarily (consciously)
oror
involuntarilyinvoluntarily (automatically)(automatically)

3. Skeletal Muscle CellsSkeletal Muscle Cells

Striated, voluntary, and multinucleatedStriated, voluntary, and multinucleated

are long, thin and cylindrical; they are are long, thin and cylindrical; they are
attached to bones and move our skeletonattached to bones and move our skeleton

are usually called “are usually called “muscle fibersmuscle fibers””

do not divide to create new cellsdo not divide to create new cells

new fibers are produced by stem cellsnew fibers are produced by stem cells

Striations -- cross stripes (bands) run Striations -- cross stripes (bands) run
perpendicular to the cellsperpendicular to the cells

4. Skeletal Muscle TissueSkeletal Muscle Tissue

5. Cardiac Muscle CellsCardiac Muscle Cells

are called “are called “cardiocytescardiocytes” and found in ” and found in
heart wallsheart walls

branching cells connect at branching cells connect at intercalated intercalated
disks disks which allow contractions to occur which allow contractions to occur
fasterfaster

are regulated by pacemaker cells which are regulated by pacemaker cells which
control contraction of the heart musclescontrol contraction of the heart muscles

striated, involuntary, and single nucleusstriated, involuntary, and single nucleus

6. Cardiac Muscle TissueCardiac Muscle Tissue

7. Smooth Muscle CellsSmooth Muscle Cells

are small and pointed at their endsare small and pointed at their ends

can divide and regenerate new cellscan divide and regenerate new cells

non-striated, involuntary, and single nucleusnon-striated, involuntary, and single nucleus

found in hollow organs like the intestine, found in hollow organs like the intestine,
bladder, lungs, and blood vesselsbladder, lungs, and blood vessels

move substances through hollow opening move substances through hollow opening
by contracting slowly; they squeeze things by contracting slowly; they squeeze things
through like a tube of toothpastethrough like a tube of toothpaste

8. Smooth Muscle TissueSmooth Muscle Tissue

9. Review What You’ve Learned…Review What You’ve Learned…
Muscle TypeMuscle TypeStriated?Striated?# of nuclei# of nuclei
Voluntary orVoluntary or
InvoluntaryInvoluntary
SkeletalSkeletal
CardiacCardiac
SmoothSmooth
Yes
Yes
No
Single
Nucleus
Single
Nucleus
Multi-
nucleated
Voluntary
Involuntary
Involuntary