Muscles tissue unit 4

What are the three types of muscle tissues?

skeletal, cardiac and smooth

Striations

regular arrangement of actin and myosin in fibers in skeletal adn cardiac

nuclei difference between skeletal, cardiac and smooth

skeletal muscle is multinucleated; cardiac muscle cells each have 1 or 2 nuclei, and are connected to act as one unit (syncytium). 

epimysium

dense irregular connective sheath around the muscle

fascicle

bundle of fibers

perimysium

connective tissue around each fascicle

Endomysium

 connective tissue layer of collagen and reticular tissue around each fiber, or muscle cell

myofibril

organelle within fiber that contains sacromeres

sacrolemma

plasma membrane of the muscle fiber

sarcoplasm

cytoplasm within the muscle cell the sarcolemma of the muscle fiber

sacomere

functional unit of the skeletal muscle fiber

actin and myosin arranged sequentially along with regulatory proteins troponin and tropomyosin

gives skeletal muscle striated appearnace

actin

thin contractile myofilament

myosin

thick contractile myofilament