Muscle Anatomy
What structure can be described as being collagen fibers merging to connect muscle to bone.
Tendon
Found at each end of a sarcomere
Z-Line
The filament which slides during a sarcomere contraction is:
Actin
Wraps around the eye
orbicularis oculii
Biceps femoris flexes what joint?
Knee
Outermost layer of connective tissue, wraps around whole muscle.
Epimysium
Found in the center of a sarcomere
M-Line
Calcium (Ca2+)
superior, superficial, shoulder
deltoid
What is the prime mover responsible for extension of the elbow?
Triceps brachii
Lining which wraps around muscle fibers.
Endomysium
Region defined as being the length of myosin fibers
A-Band
What molecule attaches to myosin heads, allowing them to disconnect from actin and recharges them before the next pull?
ATP
largest of quadriceps muscles, responsible for extension of knee
rectus femoris
Genetic condition which weakens motor neurons without causing paralysis
ALS
amyotrophic lateral sclerosis
Lou Gehrig's disease
This stores calcium for release when stimulated by a motor neuron
sarcoplasmic reticulum
This protein covers the binding sights on actin filaments.
Tropomyosin
Rigor mortis is caused by a lack of what?
ATP
Muscle primarily responsible for allowing you to smile
zygomaticus
This phase of the muscle twitch does NOT include movement of muscle fillaments
Latent
This neurotransmitter allows neurons to transmit action potentials to the sarcolemma of muscle cells.
Acetylcholine
What structure forms cross-bridges between myosin and actin filaments?
Myosin heads
What is the name for a group of muscle fibers which are all stimulated by the same motor neuron?
Motor unit
Isotonic or isometric:
You try to bench press too much weight. The bar goes nowhere, but you're "pushing" as hard as you can!
Isometric
This muscle is primarily responsible for plantarflexion of the ankle
gastrocnemius