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AnatomyT3Q1
Question | Answer |
---|---|
Muscle that has a striped appearance is described as being | striated |
Which element is important in directly triggering contraction? | Calcium (Ca++) |
According to the sliding filament model, binding sites on actin open when | calcium ion levels rise |
During muscle contraction, the cross-bridge detaches when | the myosin head binds to an ATP molecule |
Thick and thin filaments are organized into functional units called | sarcomeres |
A sprinter would experience muscle fatigue sooner than a marathon runner due to | anaerobic metabolism in the muscles of the sprinter |
Active shortening of muscle cell and generation of tension (force) | contractility |
The electrical potential change is coupled to intracellular changes that result in | contraction |
Passive stretching of muscle cells | extensibility |
Return of muscle cells to original resting length after being stretched | elasticity |
Is the skeletal muscle voluntary or involuntary? | voluntary |
When muscles contract | the insertion moves towards the origin |
What is the smallest contractile unit of muscle called? | sarcomere |
"Power stroke" is related to the ___ model of contraction. | sliding filament |
Axons of motor neurons branch profusely as they enter muscles. Each axonal branch fors a ___ with a single myocyte. | neuromuscular junction |
Each motor neuron and all the myocytes it innervates is called a ___ | motor unit |
Though very close, axon terminals and motor endplates are always separated by a space called the | synaptic cleft |
What is a transiet plasma membrane electrical depolarization event? | action potential |