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The Muscular Sys
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The human bdy has mre thn ____ individual muscles
600 {657 2 b exact}
Muscles casuse bones & supported structures 2 mve by alternating bet _____ & _____.
"Contraction"
&
"Relaxation"
Skeletal Muscles:
Attached to bones by tendons
Cross joints so when they contract, bones they attach 2 move
Smooth Muscle
Found on organ walls
Contractions produce movement of organ contents
Functions of the Muscle: muscle has the ability 2 contract, permitting muscles 2 perform various functions.
*Functions of the Muscle*:
"Movement"
"Stability"
"Control of body openings & passages"
"Heat Production"
Functions of Muscle: *Movement*
Skeletal Muscles...
Attached 2 bones by tendons
Cross joints so when they contract, nones they attach 2 mve.
Smooth Muscle:
Found on organ walls
Contractions produce movement of organ contents
The Cardiac Muscle...
Produces "Atrial" & "Ventricular" contractions
This pumps blood frm the heart in/2 the blood vessels
Muscle Functions: *Stability*...
Holds bones tightly 2/gether
-stabilizes joints
Small muscles hold vertebrae 2/gether
-stabilizes the spinal column
Muscle Functions: *Control of Bdy Openings & Passages*
Sphincters
:
- Valve-like structures formed by muscles
- Control movement of substances in & out of passages
* Ex
: a urethral sphincter prevents or allows urination
Muscle Functions: *Heat Production*
Heat is released w/muscle contraction
:
*Helps the bdy maintain a normal temp
*Moving your bdy can mke u warmer if cold
Types of Muscle Tiss:
Myocytes
- Muscle Fibers
Sarcolemma
: Cell Membrane
Sarcoplasm
: Cytoplasm of a cell
Myofibrils
: Long structures in sarcoplasm
*Arrangement of filaments in myobibrils produces
striations
*
Muscle Tiss: Skeletal Muscle
Muscle fibers respond to the neruotransmitter acetylcholine
* Causes skeletal muscle 2 contract
Following contraction, muscles release the enzyme
Acetylcholinesterase
*
Breaks dwn acetylcholine
*
Allows muscles 2 relax
Muscle Tiss: Smooth Muscle...
Multi/Unit Smooth Muscle:
* In the iris of the eye & walls of blood vessels
* Responds 2 Neurotransmitters & Hormones
Visceral Smooth muscles
:
*In walls of hollow organs
*Responds 2 nerurotransmitters
*Stimulates ea. other 2 contract so tht muscle fibers contract & relax 2/gether in a rhythmic motion ~ Peristalsis
Smooth Muscles {Cont'd}...
Peristalisis ~ rhythmic
Author
BrowneeE
ID
89123
Card Set
The Muscular Sys
Description
MUSCULAR SYS: "MUSCLE TISSUE"
Updated
2011-06-04T20:45:17Z
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