Muscles Flashcards
(17 cards)
Smooth muscle found in
Gut, urinary bladder, uterus and blood vessels
Smooth muscle shape
Spindle shaped with elongated nucleus
Circumferential or longitudinal sheets
Single centred nucleus
Skeletal muscle found in
Voluntary muscles
Skeletal muscle shape
Thin cylindrical structure
Each fibre has precursor cells - satellite cells
Thin filaments
Actin
F-actin (Myosin binding site), tropomyosin and troponin
2 actin filaments twisted
Thick filaments
Myosin
Myosin, titin and C protein
2 poly proteins twisted
Muscle contraction
ATP and Ca2+
Organisation of muscle fibre
Sacrolemma, Terminal cistern, sarcoplasmic reticulum, muscle fibre
Triad
Terminal cist, t tube, terminal cist
Cardiac muscle
No stem cells - Form scars
One or two nuclei
Cell linkage - Intercalated disks
Intercalated discs junctions
Desmosomal junction
Adherent junction
Gap junction
Classification striated
Skeletal and cardiac muscle
Contains actin and myosin arranged in sarcomere
Classification smooth
Fibres of acting and myosin run through cell supported by framework
Apply pressure to vessels and organs
Other classification
Myoepithelial - Expel secretion from glands - Between basal plasma membrane and basal lamina Myofibroblast - Fibroblast - Fibrocytes Pericytes - Surround blood vessels - Contract vessels
Smooth vs cardiac vs skeletal muscle
Smooth - Involuntary - Weak and slow - Gastrointestinal tract Cardiac - Involuntary - Strong, quick and continues - Heart Skeletal - Voluntary - Strong, quick and discontinuous - Arm muscles
Skeletal muscle organisation
Muscle- Muscle fasicals- Skeletal muscle fibre/myofiber- Myofibrills - Myosin and actin filaments
Skeletal muscle fasciae
Muscle- Muscle fasicals- Skeletal muscle fibre/myofiber- Myofibrills - Myosin and actin filaments
Epimysium - Perimysium - Perimysium - Endomysium
