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BIOL 404-Exam 4-Muscle 8
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What does is the totoal tension?
The amount of tension developed by each fiber
The number of fibers contracting at once
What does is the total tension?
The amount of tension developed by each fiber
The number of fibers contracting at once
What does the nervous system control to manage the whole muscle tension and shortening velocity?
The tension in each fiber
The number of fibers contracting
What are the factors for tension developing in a fiber?
Action potential frequency
Fiber length
Fiber diameter
Fatigue
What are the factors that affect shortening velocity?
The load
Type of motor units
number of motor units recruited
The load, the number of motor units recruited and the type of motor units all effect what?
The Shortening velocity
An increase in the amount of contractile activity (exercise) leads to what?
An increase in the muscle size and capacity for ATP production
What can increase a muscle's size and capacity for ATP production?
Increased contractile activity
What are the two types of atrophy?
Disuse atrophy
Denervation atrophy
What type of atrophy occurs due to loss of function via nerve damage?
Denervation atrophy
What is flexion?
Brining in the lateral body proximal
What is extension?
Bringing a proximal body peripherally
Many skeletal muscle diseases are caused by what?
Parts of the nervous system that control contraction
What is poliomyelitis?
Viral disease that destroys motor neurons
May lead to paralysis and respiratory failure
What viral disease was discussed in class that destroys motor neurons and leads to paralysis and respiratory failure?
Poliomyelitis
What is a muscle cramp?
An involuntary tetanic contraction
What is the term for an involuntary tetanic contraction?
Muscle Cramp
During what situation do action potentials fire at a rate much higher than during maximal voluntary contraction?
Muscle cramps
What are muscle cramps likely due to?
Electrolyte imbalances in extracellular compartments
Electrolyte imbalances that can cause muscle cramps can develop from what?
over exercise
dehydration
What is the secondary theory for the cause of muscle cramps?
Intracellular chemical imbalances stimulate nerves that activate reflex arcs
What is Hypocalcemic tetany?
The involuntary tetanic contraction of skeletal muscle
Due to Ca <40% of norm
What is the term for tetany due to Ca<40% of its normal levels?
Hypocalcemic Tetany
Author
kyleannkelsey
ID
216931
Card Set
BIOL 404-Exam 4-Muscle 8
Description
BIOL 404-Exam 4-Muscle 8
Updated
5/1/2013, 5:17:49 AM
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