Chapter 8: Control Of Movement Flashcards
are the ones that move us around and thus are responsible for our actions.
Skeletal muscles
muscles are fastened to bones via _____, strong bands of connective
tissue.
Tendons
moving a limb toward the body, is produced by contraction of flexor muscles.
Flexion
the opposite movement or moving a limb away from the body, is
produced by contraction of extensor muscles.
Extension
The so-called antigravity muscles, the ones we used to stand up.
Flexion and Extension
the ones we used to stand up
Antigravity muscles
theLatin word that means “spindle”
Fusus
Muscles contract; limbs _____
Flex
Limbs flex; Muscles _____
Contract
Where intrafusal muscle fibers can be found?
within the spindles
Where extrafusal
muscle fibers can be found?
outside the spindles
What axon of the gamma motor neuron causes the intrafusal muscle fiber to contract?
The efferent axon
Two types of muscle fibers
extrafusal muscle fibers
alpha motor neurons
An alpha motor neuron, its axon, and associated extrafusal muscle fibers constitute ______
Motor unit
A single muscle fiber consists of a bundle of ______.
Myofibrils
Overlapping strands
Actin and myosin
skeletal muscle is often referred to as _______.
Striated muscle
The synapse between the terminal button of an efferent neuron and the membrane of a muscle fiber is called a ________.
Neuromuscular junction
located in grooves along the surface of the muscle fibers.
Motor endplates
When an axon fires, acetylcholine is liberated by the terminal buttons and produces a depolarization of the postsynaptic membrane.
Endplate potential
always causes the muscle fiber to fire, propagating the potential along its lemgth
endplate potential
Where are the stretch receptors are located within the tendons?
Golgi tendon organ
