Muscle cells
How long is a skeletal muscle cell?
the entire length of the muscle
Name of the fibrous covering of a whole muscle
epimysium
What two filaments bind in the process of muscle contraction?
thin and thick
Name of the primary motor neurotransmitter
acetylcholine
Name the 3 types of muscle
Skeletal, cardiac, smooth
What is the name of the repeating structural unit which performs muscle contraction?
the sarcomere
Name of the fibrous covering of a single muscle fiber
endomysium
What ion is released by the sarcoplasmic reticulum, and exposes the active site on the thin filaments ?
Ca 2+
synaptic cleft
Name which of the 3 types of muscle are under voluntary and involuntary control
Skeletal- Voluntary
Cardiac- Involuntary
Smooth- Involuntary
What is the name of the organelle which holds Ca 2+ ions in muscle cells?
sarcoplasmic reticulum
Name of a bundle of muscle cells
fascicle
What protein makes up the thick filament?
myosin
What type of neuron meets the muscle cell at the neuromuscular junction?
motor neuron
name at least 2 of the 5 functions of the muscular system
movement of the skeleton, maintain posture and body position, support soft tissues, guard entrances and exits, and maintain body temperature
What is the name of the muscle cell membrane?
sarcolemma
Name of the fibrous covering of a bundle of muscle cells
perimysium
The latching of the thick filament onto the thin filament in the process of contraction is known as
cross-bridge formation
Name of the enzyme which degrades the primary motor neurotransmitter
acetylcholinesterase
Muscle cells have a lot of this common organelle
mitochondria
What is the name of the structure which connects the muscle cell membrane to the sarcoplasmic reticulum, allowing the cell's action potential to reach the sarcoplasmic reticulum?
T tubules
Tissue that connects muscle to bone
tendon
Ca 2+ binds to ______, which slides ________ off the actin active site, allowing the thick filament to attach to actin
troponin, tropomyosin
Acetylcholine triggers an action potential in the muscle cell by increasing the membrane's permeability to which ion ?
Sodium: Na+
Which muscle type is multinucleated?
skeletal muscle