Skeletal Muscle Phys (effect Of Stimulus Voltage On Skeletal Muscle Contraction

Question 1

What is tension?

Answer 1

when a skeletal muscle produces a muscle force, which is activated by nervous or electrical stimulation

Question 2

What determines the strength of tension?

Answer 2

-number of active motor units activated at a given moment

Question 3

What is motor unit recruitment?

Answer 3

-increasing the number of active motor units, you can produce a steady increase in muscle force

Question 4

What is threshold voltage?

Answer 4

-the smallest stimulus required to induce an action potential in a muscle fibers plasma membrane, or sarcolemma

Question 5

What is maximal voltage?

Answer 5

-maximal tension in a whole muscle occurs when all the muscle fibers have been activated by a sufficiently strong stimulus

Question 6

Skeletal muscles are innervated by

Answer 6

Motor neurons

Question 7

A single action potential propagating down a motor axon results in

Answer 7

A single action potential and a single contractile event in the muscle fibers it innervates

Question 8

In resting skeletal muscle, calcium is stored in

Answer 8

The sarcoplasmic reticulum