Skeletal Muscle Physiology Flashcards
What is muscle?
Specialized tissue that can contract and turn energy into motion
Functional divisions of muscle
Voluntary and involuntary
Structural divisions of muscle
Striated and smooth
Property of skeletal muscle
Striated voluntary
Property of smooth muscle
Smooth involuntary
Property of cardiac muscle
Striated involuntary
Location of skeletal muscle
Most abundant tissues, attached to skeleton bones
Location of smooth muscle
BVs, digestive sys, bladder
Location of cardiac muscle
Walls of heart
Function of skeletal muscle
Move and support skeleton
Function of smooth muscle
Controls slow and involuntary movements
Function of cardiac muscle
Contraction of atria and heart ventricles, as well as blood circulation throughout the body
How is skeletal muscle attached to bone?
Tendons
What is a tendon?
Bundle of collagen fibres
What is skeletal muscle made up of
Thousands of muscle fibres wrapped in connective tissue sheaths. Very long, cylindrical, multinucleate
How are muscle fibres formed
During development, myoblasts fuse with eachother to make myotubes
What are myofibres composed of
Myofibres (muscle fibres) are composed of myofibrils, which are made of up filaments/myofilaments that contain actin and myosin
Bending pattern
In skeletal muscle, have this when looked at under microscope because of filament arrangement in muscle fibres
Endomysium
Connective tissue layer surrounding a fiber
Fascicle
Group of indiv muscle fibres
Perimysum
Connective tissue layer surrounding a fascicle
Epimysium
Connective tissue sheath surrounding the muscle
Tendon
Connective tissue layers at the ends of the muscle that attach the muscle to the skeleton at a myotendinous junction
What is a myotendinous junction?
A specialized location at muscle-tendon interface that acts as primary site of force transmission
