MuscleMuscle TissueTissue

Three Types of Muscle TissueThree Types of Muscle TissueSkeletal or Striated MuscleSkeletal or Striated Muscle– Makes up all muscles that are attached to bonesMakes up all muscles that are attached to bones– Contractions allow the organism to moveContractions allow the organism to move

Smooth Muscle Smooth Muscle – Found in the walls of hollow muscular organs, parts of Found in the walls of hollow muscular organs, parts of

the trachea and bronchioles and the walls of blood the trachea and bronchioles and the walls of blood vesselsvessels

– Various functions, depending on the organVarious functions, depending on the organ

Cardiac MuscleCardiac Muscle– Found in the walls of the heartFound in the walls of the heart– Contractions move blood through the chambers of the Contractions move blood through the chambers of the

heart, or to the major arteries leaving the heart.heart, or to the major arteries leaving the heart.

Skeletal MuscleSkeletal MuscleThe elongated fibers of skeletal muscle are The elongated fibers of skeletal muscle are striated.striated. The striations are dark and light stripes The striations are dark and light stripes along the muscle cell due to the arrangement of along the muscle cell due to the arrangement of the protein filaments, or the protein filaments, or myofilamentsmyofilaments within the within the muscle fiber.muscle fiber.Contractions of skeletal muscle can be regulated Contractions of skeletal muscle can be regulated by conscious control, therefore, it is considered to by conscious control, therefore, it is considered to be be voluntaryvoluntary..A skeletal muscle cell is A skeletal muscle cell is multinucleatedmultinucleated, which , which means it has more than one nucleus.means it has more than one nucleus.Skeletal muscle fibers are surrounded by, and Skeletal muscle fibers are surrounded by, and bundle by several layers of connective tissue. bundle by several layers of connective tissue.

Skeletal Muscle

Smooth MuscleSmooth MuscleSmooth muscle fibers are spindle-shaped Smooth muscle fibers are spindle-shaped and smaller than skeletal and cardiac and smaller than skeletal and cardiac muscle fibers.muscle fibers.Each cell contains only one nucleusEach cell contains only one nucleusFibers are not arranged in an orderly Fibers are not arranged in an orderly manner and thus are not striatedmanner and thus are not striatedIndividual smooth muscle fibers are Individual smooth muscle fibers are surrounded by connective tissue, but the surrounded by connective tissue, but the fibers are not bundled like skeletal musclefibers are not bundled like skeletal muscleSmooth muscle is Smooth muscle is involuntaryinvoluntary and and contractions are controlled subconsciously contractions are controlled subconsciously by the brainby the brain

Smooth Muscle

Cardiac MuscleCardiac MuscleCardiac muscle fibers are striatedCardiac muscle fibers are striatedFibers contain one or two nucleiFibers contain one or two nucleiFibers are branched and are smaller in diameter Fibers are branched and are smaller in diameter than skeletal musclethan skeletal muscleFibers are connected by zig-zaggety membrane Fibers are connected by zig-zaggety membrane specializations called specializations called intercalated discsintercalated discsEach muscle fiber is surrounded by connective Each muscle fiber is surrounded by connective tissue, but the fibers are not bundled.tissue, but the fibers are not bundled.Cardiac muscle contraction are controlled Cardiac muscle contraction are controlled subconsciously by the brain, which makes it subconsciously by the brain, which makes it involuntaryinvoluntary

Cardiac Muscle