Homework Sourse1 If all of the nerves that innervate the SA node are cut th
1. If all of the nerves that innervate the SA node are cut, the heart rate increases. What does this imply about the relative amounts of SNS and PSNS input to the heart under normal conditions?
2. During exercise, both HR and SV increase. HR cannot increase above a certain limit; this is actually advantageous because if it increased TOO much, the SV would actually decrease! Why is that so?
1. If all of the nerves that innervate the SA node are cut, the heart rate increases. What does this imply about the relative amounts of SNS and PSNS input to the heart under normal conditions?
2. During exercise, both HR and SV increase. HR cannot increase above a certain limit; this is actually advantageous because if it increased TOO much, the SV would actually decrease! Why is that so?
2. During exercise, both HR and SV increase. HR cannot increase above a certain limit; this is actually advantageous because if it increased TOO much, the SV would actually decrease! Why is that so?
Solution
1. SNS and PSNS under normal conditions
2. HR and SV increment
