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Section 1 Exam Notes
Terms in this set (14)
What is the most accurate name for a muscle cell membrane?
Describe the process by which acetylcholine generates an action potential in a muscle fiber (step 1)
-AP in the motor neuron results in the release of acetylcholine receptor on the muscle cell membrane
Describe the process by which acetylcholine generates an action potential in a muscle fiber (step 2)
-The acetylcholine diffuses across neuromuscular junction and binds to acetylcholine receptor on the muscle cell membrane
Describe the process by which acetylcholine generates an action potential in a muscle fiber (step 3)
-2 acetylcholine molecules bind to the receptor, the receptor will open and allow Na+ to move down concentration gradient into muscle fiber
Describe the process by which acetylcholine generates an action potential in a muscle fiber (step 4)
-Membrane voltage change generated from the opening of the Ach receptors will result in the opening of voltage-gated Na+ channels and rest of cell membrane will depolarize
What structure propagates an AP inside of a muscle fiber?
What is a SERCA pump (acronym)?
Sarcoplasmic Reticulum Calcium ATPase Pump
Where is the nerve cell body of a motor neuron located in body?
What happens to a motor unit if the nerve cell body receives a large amount of excitatory post synaptic potentials?
It will be depolarized
Describe 2 ways in which motor units differ in size
-Nerve cell body size
Primar neural adaptation in skeletal muscle in response to resistance training that results in an increase in max voluntary force production?
Increased motor unit recruitment
Identify 1 unique characteristic of the pain associated with DOMS
Pain during contraction
What happens to fiber type composition in skeletal muscle as people get older?
Reduction in type II as people age
How many neuromuscular junctions are present on a single muscle fiber in adult skeletal muscle?
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Section 2 Exam
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