Gross Anatomy
What level of organization is a muscle
organ
the movement of the cross bridge is referred to as this
power stroke
the ability to be stretched is referred to as this
extensibility
the space containing extracellular fluid between the end of an axon and a single muscle cell
synaptic cleft
Time after stimulation until the initiation of the actual sliding of the filaments
latent period
Other than bones, name another place of muscle attachment
Cartilage, connective tissue, or other muscles
this ion binds to troponin on the actin filaments to unblock the active sites
calcium
recoiling to resting length after being streched is this
elasticity
these zones disappear during contraction
H zones
the muscle neither shortens nor lengthens during this contraction type
isometric
The end of the muscle that's usually attached to the less movable, more proximal bone or structure
origin
during cross bridge detachment, this molecule binds to the myosin to break the myosin-actin bond
ATP
a characteristic of muscle tissue which no other tissue type has
contractility
at the NMJ, acetylcholine receptors are found only on this
highly folded sarcolemma
the period following contraction when a muscle fiber will not respond to a second stimulus
absolute refractory period
The covering of dense irregular connective tissue around a whole muscle
epimysium
Excitation occurs at this location
NMJ
muscle and nervous tissue have this characteristic, defined by receiving a stimulus
excitability
term describing the state at which the inside of the cell is negative relative to the outside and is at the resting membrane potential
polarized
in isotonic contraction, these filaments are sliding, changing the length of the muscle
thin (actin) filaments
the ropelike attachments that are an extension of epimysium serve two purposes
greater movement and conserve space
Calcium is moved back to the sarcoplasmic reticulum by this mechanism
active transport (Uses ATP and carrier molecule
muscles serve four main functions. Name 3.
produce movement, maintain posture, stabilize joints, generate heat
chemically gated channels give some depolarization, but these channels give much more and will change the charge of the cell
voltage-gated channels
this tool records changes in electrical potential as a result of motor unit recruitment
electromyograph