Muscle Tissue Flashcards
THree types of muscle tissue
Skeletal Smooth Cardiac
Skeletal Muscle
40% of the body’s weight
Responsible for voluntary movements
Attached to bones
Cell shape long and cylindrical
Smooth msucle
Most widely distributed muscle in the body Involuntary; performs necessary functions such as moving food through digestive tracts, etc. The cell is spindle-shaped
Cardiac muscle
Only found in the heart Contracts spontaneously and rhythmically Involuntary Cells are cylindrical and branched
Functions of skeletal msucle
1) movement of pody 2) mantenance of posture 3) Respiration 4) Production of body heat 5) Communication (speaking, writing, typing, etc.)
Function of smooth muscle
Constriction of organs and vessels
Function of cardiac muscle
Contraction of the heart
4 functional properties of muscle tissue
COntractility Excitability Extensibility Elasticity
Contractility
The ability of muscle to shorten forcefully and lengthen passively
Excitability
Capacity fof muscle to respond to electrical stimulus
Extensibility
ability of muscle to be stretched eyond normal resting length and still be able to contract
Elasticity
ability of muscle to spring back to its original resting length after beign stretched
Skeletal muscle fibers
a complete skeletal muscle organic consisting of cells
Fascicles
A visible bundle of connective tissue that composes a muscle
Perimyseum
A layer of connecteive tissue that surrounds a fasciculus
Epimysium
A layer of dense irregular collagenous connective tissue that surrounds the entire muscle
Muscular fascia
Sheets of dense irregular collagenous connective tissue that separates individual muscles or groups of muscles. Located superficial to the epimysium