Histology and Physiology of Muscles and Nerves - Skeletal Flashcards
What is the role of muscle cells?
Specialized contractile cells, generate motile forces through contraction
Move body parts or temporarily alter the shape of internal organs
What generates motile forces in muscles?
Motile forces are generated by the interaction of the proteins Actin and Myosin (Contractile proteins)
Name structures A-D
cross section shown
Name the structures in the histogram
A = A band
I = I band
C = capillary
N = nucleus
P = perimysium
Z = Z disc
E = endomysium
S = sarcomere
F = muscle fibre
SC = satellite cell
H = H zone
CT = connective tissue
What is the sarcomere?
A sarcomere is the most basic repeating structural unit of skeletal muscles and occurs between two Z lines of the actin and myosin filaments.
Name components A and B
A = Z disc
B - M line
Name structures A and B
A = I band
B = A band
Name structures A and B
A = thin filament
B = thick filament
Name structures A-C
A = A band
B = Z disk
C = I band
What type of muscle is this and name A and B
Where are the nuclei arranged in skeletal muscle?
Nuclei arranged at the cell periphery
What is contraction controlled by?
motor unit
What does the size of the fasciculi reflect?
function of the muscle
example
Ocular muscles – Small fasciculi & large
supporting tissue
Gluteal muscles– Large fasciculi & little
supporting tissue
What is a neuromuscular junction?
A neuromuscular junction (or myoneural junction) is a chemical synapse between a motor neuron and a muscle fiber
How is each skeletal muscle fibre contracted?
Each skeletal muscle fibre is contacted by a single nerve terminal from a motor neurone
How many muscle fibres does 1 motor neuron contact?
each motor neurone contacts many muscle fibres at motor end plates (= motor unit)
What is shown in this diagram?
motor end plates
Name components A and B
Decipher what fibre is fast and slow
A = slow
B = fast
What is R and W? (muscle fibres)
Name structures A-G
