Question

answer BOTH. please explain and answer both questions thoroughly. will only rate if both are answered. need answers asap

4) Skeletal and cardiac muscle are both types of striated muscle. You have been given one type of each sample, but the identifying labels have come off. You know that these muscles have some similarities and some differences in terms of their rate of depolarization, rate of repolarization, and length of action potential. Which of these features would not be useful in identifying the two types of muscle? Which of these features will you use to correctly label the samples? Explain what you would expect to see for skeletal and cardiac muscles for each feature that you use. 5.) How are the dynamics of Caz involved in summation and tetanus?

Answer 1

4. The duration of the action potential in cardiac muscle is 200-409 msec to aid in pumping of blood

The action potential duration of skeletal muscle is 2-4 msec

There is no difference in the duration of polarization and polarization between both

5. Summation happens when the skeletal muscle gets activated before it relaxes leading to greater force of contraction this because more Ca gets released and more sarcomeres are shortened

Tetanus is when the frequency of stimulation is so high that the relaxation phase is completely abolished this causes release of all the calcium and shortening of a the sarcomeres leading to sustained contraction