Chapter 6- Muscular System Flashcards
Myosin
Bundled molecules of protein
Aponeuroses
Fibrous or membranous sheet connecting a muscle and the part it moves.
Actin
A contractile protein
Motor Unit
One neuron and all the skeletal muscle cells it stimulates.
Neuromuscular junction
Contain vesicles filled with a chemical in an axon terminal
Neurotransmitter
A chemical that Fills neuromuscular junction
Acetylcholine
A neurotransmitter that stimulates skeletal muscle
Synaptic cleft
The gap between nerve endings and muscle cells that is filled with tissue fluid.
Action potential
Conducts the electrical impulse from one End of the cell to the other.
Creative phosphate
Found in muscle fibers but not in other cell types.
Aerobic respiration
Occurs in mitochondria and involves a series of metabolic pathways that use oxygen.
Lactic acid
Purification acid generated during glycosis and converted
Anaerobic glycosis
When oxygen is low and lactic acid is produced.
Oxygen deficit
Not enough oxygen and occurs during prolonged muscle activity.
Origin
Attached to immovable bone
Insertion
Attached to movable bone.
Extension
Increases angle between two bones
Flexion
Decreases angle, bringing two bones closer together
Abduction
Moving a limb away from the midline.
Addiction
Movement of limb toward the midline.
Dor sickening
Lifting it foot so it’s superior surface approaches the skin.
Plantar flexing
Depressing the foot.
Supination
The Palm faces anteriorly
Pronation
Palms face posteriorly.
Prime mover
Muscle that has the major responsibility for causing a particular movement
Antagonists
Muscles that oppose or reverse a movement
Synergists
Help prime movers by producing same movement
Fixators
Specialized synergists
Tendons
Attach muscles indirectly to bones.
