Question

need help In this 4 question please and thank you

Question 10 (2 points) (True/false) During the rising phase of the action potential, the charge inside of the axon changes from negative to positive (depolarizes) True False Question 11 (2 points) (True/false) During the rising phase of the action potential, potassium channels (gates) open and allow the cell to depolarize. True False

Answer 1

10) True

reason: An increase in ionic conductance in the membrane of the axon results in an increase in the action potential. The rising phase of the action potential is caused by an influx of Na+,

11) false

reason: The rising phase of the action potential is caused by an influx of Na+,not because of K+

• )The sympathetic system is activated, except point c,all other points we can see . because if the sympathetic system is activated, heart rate will increase and also increase myocardial contraction Because sympathetic nerve system will release norepinephrine ,it will increase heart rate