Flashcards in Basic Structure of Muscle, Cartilage & Bone Deck (9):
Describe the organisation of muscle cells in to whole muscles
Individual muscle cells are covered by endomysium, and arranged in to fascicles
Fascicles are covered with perimysium
Fascicles aggregate to form whole muscle, which is covered by epimysium
What is the structure of skeletal muscle?
Peripheral nuclei in rows
Lots of mitochondria to produce ATP
Can repair by satellite cells
What is the structure of smooth muscle?
Spindle shaped cells with a central nucleus
Able to repair by mitosis
Can have modified smooth muscle cells e.g. Myoepithelial or myofibroblast
What is the structure of cardiac muscle?
Centrally positioned nuclei
Intercalated discs - instead of Z bands
T-tubules and terminal cisternae
Unable to repair
Describe the structure of the filaments in striated muscle
Z bands connect to actin filaments
M band connect to myosin
Actin and myosin cross over at the A band (dArk in appearance)
Actin alone in the I band (lIght in appearance)
Myosin alone in the H band (ligHt in appearance)
Myosin heads, actin fibres surround by tropomysin with troponin
What is meant by cartilage?
An avascular tissue of mesenchymal origin that consists of an extensive extracellular matrix, containing chondrocytes, and extracellular fibres
Three different types: hyaline, elastic, fibrocartilage
What are the key features of hyaline cartilage?
Avascular-> relies on diffusion to obtain nutrients
Type 2 Collagen
End of long bones
Anterior end of the ribs
Firm and flexible support to allow the movement of tissues
What are the key features of fibrocartilage?
Type 1 Collagen
Portions of the tendons
Very strong and resistant to stretching and compression