Muscle Types
muscle type found only in the heart
what is Cardiac muscle
the smallest contractile unit of muscle fiber
what is sarcomere
defined as the activation of cross bridges to generate force
what is contraction
the generation of an action potential involves these 3 aspects
what are generation of end plate potential, depolarization, and repolarization
a network of smooth endoplasmic reticulum tubules surrounding each myofibril
what is sarcoplasmic reticulum
what is smooth muscle
a line of protein that bisects H zone vertically
what is the M line
this type of neuron is what stimulates skeletal muscle cells
what are somatic motor neurons
this step causes chemically gated channels ions (ligands) on sarcolemma to open
what is generation of an end plate potential
the ability to shorten forcibly when stimulated
what is contractility
what is skeletal muscle
this myofilament is anchored to z discs
what is actin filament
this channel is opened by chemical messengers such as neurotransmitters
what is chemically gated ion channels
the AP crosses from neuron to muscle cell via this neurotransmitter
what is acetylcholine (ACh)
defined as the orderly arrangement of actin and myosin filaments within sarcomere
what is myofilaments
this muscle sheath is dense irregular connective tissue surrounding the entire muscle cell and may blend with fascia
what is epimysium
regulatory proteins bound to actin
what are tropomyosin and troponin
the end of an axon
what is axon terminal
what is repolarization
a polypeptide made up of kidney-shaped G actin subunits
what is actin
this muscle type is known for contracting rapidly; tires easily
what is skeletal muscle
this myofilament is composed of actin
what is thin filament
the four steps needed for skeletal muscle to contract
what is events at neuromuscular junction, muscle fiber excitation, excitation-contraction coupling, cross bridge cycling
this step is when Na+ voltage gated channels close and K+ voltage gated channels open
what is repolarization
function is storage of O2 molecules
what is myoglobin