Movement & Motor Control Flashcards
Exam 3
What are the three types of movements?
- Reflexes
- Rhythmic
- Voluntary
What is reflexive movement?
Involuntary movement that acts as a response to an incoming stimuli
What is rhythmic movement?
Controlled by pattern generators in brain stem; any rhythmic actions
What is voluntary movement?
Movement that is initiated to accomplish a specific goal; controlled by primary motor cortex
Flinching is an example of what type of movement?
Reflexive
Walking and chewing is an example of what type of movement?
Rhythmic
Grabbing an item or writing is an example of what type of movement?
Voluntary
Ventral roots = __________ Motor Neurons
Lower
Neurons between ventral horn and cortex = ______ Motor neuron
Upper
What is the organization of muscles from largest to smallest? (6)
- Muscle
- Fascicles
- Muscle fiber cells
- Myofibrils
- Sarcomeres
- Myofilaments
What is the Sarcolemme? What is its job?
Plasma membrane; Separate ICF from ECF
Myofibrils are made up of
sarcomeres
What is the sarcoplasmic reticulum? What does it store?
The muscle cells Endoplasmic Reticulum: Ca2+
What do myofibrils do for muscle contraction?
They shorten
What are the two types of myofilaments?
Actin and Myosin
Is actin thin or thick?
Thin (think of acTHIN)
Is myosin thin or thick?
Thick
Tropomyosin covers what binding sites? Is this binding site on actin or myosin?
Myosin binding sites; Actin
What does troponin hold in place?
Tropomyosin
Action potential depolarization travels across the ________ and then through the _____________ in order to depolarize the sarcoplasmic reticulum
Sarcolemma; T-tubules
What VG channels does the SR contain?
VGCa2+
In a relaxed state, do thin and thick filaments partially or fully overlap?
Partially
During contraction, Thin filaments slide past thick filaments, makes them
overlap more
What is the neuromuscular junction?
The synapse of a motor neuron with a muscle fiber
What is an end plate potential?
A local depolarization; diffusion of Na+ in the cell
What are EPPs comparable to?
EPSPs
What role does acetylcholine play in the generation of an AP?
It opens the ligand gated ion channels allowing Na+ to rush into cell
