Skeletal Muscle

Question 1

What are the features of skeletal muscle?

Answer 1

Cantered nuclei
Multinucleated cells
Lots of stripes and striations
Large cells

Question 2

What is present in the structure of skeletal muscle?

Answer 2

Sarcoplasmic reticulum
Nucleus
T-tubules
Sarcolemma
Mitochondria
Myofibrils
Terminal cisternae 
Triads
Sarcomere 
Z-line

Question 3

What are some structures present In myofibrils?

Answer 3

Sarcomere
M-line
I-band
H-zone
Thick and thin filaments of myosin and actin respectively
G-actin and nebulin

Question 4

What are the two types of fibres?

Answer 4

Slow twitch (type 1)
Fast twitch (type 2)

Question 5

Overview of action of skeletal muscle?

Answer 5

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