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27 Cards in this Set

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PRIMARY FUNCTION OF MUSCLE TISSUE
The prime function of muscle tissue is to change chemical energy into mechanical energy to perform work.
Function is to perform work.

THREE TYPES OF MUSCLE TISSUE
Three types of muscle tissue is skeletal, smooth and cardiac.
Three types of muscle tissue.
SKELETAL MUSCLE TISSUE
Skeletal muscle tissue is primarily attatched to bones. Mostly voluntary. Striated.
Three qualities
CARDIAC MUSCLE TISSUE
Cardiac muscle tissue forms the wall of the heart. Striated. Involuntary movement.
Heart.
SMOOTH MUSCLE TISSUE
Smooth muscle tissue primarily located in walls of hollow organs. Involuntary movement. Nonstriated.
Nonstriated.
MAJOR FUNCTIONS OF MUSCLE TISSUE
Helps with locomotion. Posture stability.
Thermoregulation.
Move substances in body.
Regulate organ volume.
Five functions of muscle tissue.
SPECIAL PROPERTIES OF MUSCLE TISSUE.
Electrical excitability.
Contractability.
Extensibility.
Elasticity.
Four special properties.
ELECTRICAL EXCITABILITY
Electrical excitability: ability of tissue to respond to stimuli produced by action potentials.
Electricity.
CONTRACTABILITY
Contractability: ability of muscle to generate tension to do work.
What is the purpose of muscle contraction?
EXTENSIBILITY
Extensibility: ability of muscle to extend (stretch).
Extension.
ELASTICITY
Elasticity: ability for muscle to return to original shape after having been extended or contracted.
Rubber band.
CONNECTIVE TISSUES SURROUNDING MUSCLE TISSUE
Connective tissues surrounding muscle are the epimysium, perimysium and endomysium.
Epimysium, perimysium and endomysium.
EPIMYSIUM
Epimysium covers the entire muscle.
Epi means upon.
PERIMYSIUM
Perimysium covers entire fascicle.
Peri means around.
ENDOMYSIUM
Endomysium covers muscle fibers.
Endo means within.
ANATOMY OF A SKELETAL MUSCLE FIBER
A skeletal muscle consists of individual muscle fibers (cells) bundled into fascicles and surrounded by three connective tissue layers that are extensions of the deep fascia.
Muscle cells. Fascicles. Deep fascia.
SCHEMATIC OF SKELETAL MUSCLE
The organization hierarchy of skeletal muscle is as follows:
Single celled muscle fiber
Myofibril(more subdivisions)
BREAKDOWN OF MYOFIBRILS
Myofibrils consist of A Bands, H Bands, I bands, Z disks and sarcomeres.
ZIAH
MYOFIBRIL
A threadlike structure, extending longitudinally through a muscle fiber (cell) consisting mainly of thick filaments (myosin) and thin filaments (actin, troponin and tropomyosin).
Intricate structure.
SARCOMERE
Basic functional unit of a myofibril.
Basic unit of myofibril.
H BANDS
Narrow center of each A Band that contains thick but not thin filaments.
I BANDS
Lighter, less dense area of muscle cell that contains only thin filaments, but no thick filaments.
A BANDS
Darker middle part of sarcomere. Extends entire length of thick filaments.
SARCOPLASMIC RETICULUM
A fluid filled system of membranous sacs that encircles each myofibril.
SARCOPLASM
The cytoplasm of a muscle fiber.
MYOSIN
Myosin functions as a motor protein in all three types of muscle tissue.
ACTIN
Actin