Skeletal Muscle Flashcards
1
Q
What are the features of skeletal muscle?
A
Cantered nuclei
Multinucleated cells
Lots of stripes and striations
Large cells
2
Q
What is present in the structure of skeletal muscle?
A
Sarcoplasmic reticulum Nucleus T-tubules Sarcolemma Mitochondria Myofibrils Terminal cisternae Triads Sarcomere Z-line
3
Q
What are some structures present In myofibrils?
A
Sarcomere M-line I-band H-zone Thick and thin filaments of myosin and actin respectively G-actin and nebulin
4
Q
What are the two types of fibres?
A
Slow twitch (type 1) Fast twitch (type 2)
5
Q
Overview of action of skeletal muscle?
A
Ach released from motor neurons Brief depolarisation Na+ voltage gated Channel opens Muscle fibres fire action potentials Voltage gated ca2+ channels activate RuR on the SR Ca2+ release from SR Cytoplasmic Ca2+ Muscle fibre twitch occurs
