The Basics
All muscles are ______, meaning they have an electrical impulse can make them contract
excitable
Long, multinucleated cell that generates force when stimulated
muscle fiber
The Z line is the end of the
sarcomere
Muscle that has a striped appearance is described as being
striated
During which phase of a twitch in a muscle fiber is tension the greatest?
contraction phase
The 3 types of muscle tissue
skeletal, cardio, smooth
Bands of tough, fibrous CT that connect muscle to bone
Tendons
This band has uniformity in all directions
I band
Which element is important in directly triggering contraction?
calcium
During muscle contraction; the cross-bridge detaches when the myosin head binds to an ________ molecule
ATP
_______ muscles are skeletal muscles that contract and relax under conscious control
Voluntary
Small bundle of muscle fibers
fasciculus
Sarcomere's arrangement gives it a ________ appearance
striated
The cell membrane of a muscle fiber is called
sarcolemma
In muscle damage the torn fibers lead to
leakage
The 2 contractile proteins in muscle
actin and myosin
_______ coalesce to form tendons at each end of muscle
Sheaths
No actin-myosin overlap takes place in this zone
H zone
As sarcomere contracts thin filaments slides towards
center
Thin and thick filaments are organized into functional units called
sarcomeres
Smooth muscle lines the _______ of blood vessels, respiratory, urinary, reproductive systems
passageways
_______ helps prevent spread of signal for muscle activation
Epimysium
Amount of _______ dictates force
overlap
The correct order for the smallest to the largest unit of organization in muscle tissue is
(fascicle; filament; muscle fiber; myofibril)
filament; myofibril; muscle fiber; fascicle
In relaxed muscle; the myosin-binding site on actin is blocked by
tropomyosin