Neuromuscular Control Flashcards Preview

PTRS 825 Final Exam > Neuromuscular Control > Flashcards

Flashcards in Neuromuscular Control Deck (21)
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1

Electrophysiology

Neurons and myocytes maintin resting potential of -70 mV
K+ - intracellular
Cl- - extracellular

2

Neuromuscular Communication

Development and propagation of action potentials
Influx of Na+ -> depolarizes membrane form -70 to 30 mV -> efflux of K+ hyperpolarizes

3

Absolute Refractory

Can't generate another action potential
When Na+ channels are open

4

Relative Refractory

Difficult but possible to regenerate action potential (need strong stimulus)

5

Factors Determining Velocity of AP

Diameter - larger is faster
Myelin - from 200 m/s

6

Graded Potential

Local disturbances in post-synaptic membrane potential
Arise from ion channels

7

Excitatory Post-Synaptic Potentials

Increase Na+ permeability

8

Inhibitory Post-Synaptic Potentials

Decrease Na+ permeability
Increase Cl- permeability

9

Motor Unit

Basic functional unit of skeletal muscle
Fibers innervated by same motor neuron contract/relax together
1 neuron can innervate 1-200 fibers

10

Thalamus

Contributes to motor generation and self-monitoring (corollary discharge)

11

Hypothalamus

Regulates internal environment to maintain homeostasis

12

Hypothalamus Functions

Temperature
BP/HR
Respiration/digestion/emotion
Sleep-wake
Appetite

13

Cerebellum

Receives visual and proprioceptive input
Compares actual movement to motor plane
Coordinates timing and sequence of muscle activity

14

Cerebellum Example

Touching nose with eyes closed

15

Brain Stem

Autonomic regulatory centers for respiratory and cardiovascular centers

16

Reticular System (Brain Stem)

Coordinates muscle function
Maintains muscle tone
Contributes sleep-wake and consciousness
Pain control

17

Sensory System

Transmits info from sensory organs, skins, blood and lymph vessels, tendons, and muscle to central somatosensory areas

18

Pyramidal Motor System

Innervate motor neuron in spinal cord and brainstem
Voluntary movement

19

Extrapyramidal Motor System

Located in reticular formation
Involved in reflexes, postural control and coordination of movement

20

Sympathetic

Fight or Flight
Important implications for exercise due to control of HR, vasculature and respiration

21

Parasympathetic

Feed and Breed
Promote synthesis of glycogen