Question 1
Norepinephrine acts on the heart by ________.
◦ blocking the action of calcium
◦ decreasing heart contractility
◦ causing a decrease in stroke volume
◦ causing threshold to be reached more quickly
Question 2
If the vagal nerves to the heart were cut, the result would be that ________.
◦ parasympathetic stimulation would increase, causing a decrease in heart rate
◦ the atrioventricular (AV) node would become the pacemaker of the heart
◦ the heart would stop, since the vagal nerves trigger the heart to contract
◦ the heart rate would increase by about 25 beats per minute