Muscle architecture

Overview?
Muscle fibre, myofibril, muscle fasicle, filament, proteins
Fasicle, muscle fibres, myofibril, filaments, proteins
Physiological - CSA?
Area of cross-section of muscle perpendicular to its fibres
Area of cross section
What is the angle of pennation?
Angle between longitudinal axis of the whole muscle and its fibres
Angle of muscle to it fibres
What offsets angle of pennation?
A larger physiological cross-sectional area
Increased strength
Epimysium covers entire surface of muscle belly?
True
False
Perimysium covers the muscle bundle (fascicle)?
False
True
The endomysium surrounds what?
Fascicle
Muscle belly
Individual muscle fibres
Z lines are in the middle of the sarcomere
True
False
M line is the middle of the sarcomere
Yes
No
What molecules are actin bound with?
Tropomyosin and 3 troponins
3 tropomyosins and a troponin
Sarcoplasmic reticulum surrounds each myofibril and does what?
Stores and releases potassium
Stores and releases calcium
T-tubules run into the sarcomere at two points: the level of the A and I bands
True
False
T tubules do what?
Contain a large number of calcium channels to pump calcium from SR in and out of sarcomere
Contain a large number of calcium channels to pump calcium from sarcoplasm in and out of SR
A Motor unit is what
A motoneuron and all the fibres it innervates
The cortico-putamino-pallidal-thalamo-cortical pathway
Each muscle fibre is innervated by what
Nucleus
Terminal cisternae
Axon
What is the neuromuscular junction
The synaptic connection between the axon branch and the muscle fibre
Afferent connection between the muscle fibre and the CNS
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