The Neuron
Which neuron would connect to a muscle?
A
This molecule moves into the cell during action potential propagation
Sodium
An eccentric contraction
involves this kind of length
change
Negative
ATP is hydrolized when muscles..
Generate Force
The numerical average of this signal is?
0
What cells surround and form myelin sheaths around nerve cells
Schwann Cells
The difference in ion concentrations inside and outside the membrane is maintained by the following mechanism.
Sodium Potassium Pump
1cm2 of fast glycolytic fibers generates how much more
force than 1cm2 of slow twitch fibers?
Equal amounts of force
Action potentials arrive at the sarcoplasmic reticulum via..
Transverse Tubules
EMG stands for
Electromyography
The neuron cannot respond to a second stimulus, no matter how strong.
Absolute Refractory Period
Use this method to achieve bidirectional flow of action potentials
Artificial Stimulation
The muscle contraction type illustrated is?
Concentric
The ratio of muscle fibers to nerve in motor units of the Obicularis oculi is likely to be:
10 to 1
The bulk of the EMG
signal is derived from
the depolarization of
the:
1- axon
2- sarcolemma
2- sarcolemma
Which Neuron is never myelinated
B
Receipt of an action potential at the axon terminus results in?
Release of Neurotransmitter
The muscle contraction indicated by the arrow is what type?
Isometric
Which of the workloops illustrated would be produced during an isometric contraction?
B
We need this kind of electrode in order to measure motor unit action potentials
Indwelling
What is the total linear distance of all the axons in the human brain?
176,000 km (4x around the earth)
During depolarization cellular concentrations change by?
0.01%
The antogonist to the genioglossus is?
Styloglossus
OR
Hyoglossus
The antogonist to the genioglossus is?
Styloglossus
OR
Hyoglossus
According to the Henneman Size Principle muscles are recruited sequentially based on fiber type. What is the key cellular characteristic that enables this relationship?
Different threshold frequencies