The point of contact between a motor neuron and the muscle fiber it serves
What is Neuromuscular Junction
300
Quickly breaks down ACh muscle fiber cannot be further stimulated to contract until another impulses arrives from the motor neuron
What is Acetylcholinesterase
300
Stored calcium ions are released into the ________ around the thick and thin filaments
What is Sarcoplasm
300
The myosin head splits the ATP and uses it to ______, ready to engage the next actin binding site
What is 'recock'
300
Single stimulus from a motor neuron that produces a single contraction of a muscle fiber
What is Twitch
400
Excess ATP in resting muscle combines with creatine to form creatine phosphate
What is Creatine Phosphate
400
Muscle tension increases but the entire muscle does not change
What is Isometric
400
Occurs when action potentials arrive one after another, before the relaxation phase is completed
What is Wave Summation
400
Occurs if another stimulus arrives just after completion of the relaxation phase of the preceding twitch
What is Treppe
400
Calcium ions bind to troponin, active sites exposed, myosin binds to actin, cross-bridges form
What is the Contraction Phase
500
At peak activity, oxygen demand exceeds ability of lungs to supply it. Mitochondria can't make enough ATP aerobically for exercising muscle
What is Anaerobic Cell Respiration
500
Also called white fibers. Largest in diameter. Fastest, most powerful contractions
What are Fast Fibers
500
Little myoglobin but lots of glycogen. Contract quickly, intermediate resistance to fatigue
What are Intermediate Fibers
500
Once active sites are exposed, energized myosin heads bind to them, forming _____
What are Cross-Bridges
500
If action potentials continue to arrive, a muscle can only partially relax between stimuli. The result is a sustained, but wavering, contraction called ______