0 / 1 ptsQuestion 2ABC- 60mV-0mV-70mRefer to the figure of 3 action potentials.Which action potential(s) contain a calcium current?O ConlyOA onlyA and CO A, B and CO B onlyB and CA and BA

Option A shows graph for action potential of SA node where calcium ion movemwnt is shown so this is…

Answered: A B - 60mV -70 Refer to the figure of 3…

Cardiopulmonary Anatomy & Physiology

7th Edition

ISBN:9781337794909

Author:Des Jardins, Terry.

Publisher:Des Jardins, Terry.

Chapter12: Electrophysiology Of The Heart

Section: Chapter Questions

Problem 3RQ

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15 An inward K+ current is responsible for the depolarization phase of the action potential. true or false
During strenuous exercise, which of the following changes most influences total peripheral resistance?A. Decreased blood viscosityB. Decreased Sympathetic cholinergic activityC. Increased sympathetic adrenergic activityD. Vasodilation in skeletal muscle
Excericse affects your heart rate. Then describe how the action potential graph would change due to this situation( excercise ) . Discuss repolarization / hyperpolarization, and the time between action potential peaks.
During strenuous exercise, which of the following changes most infuences total peripheral resistance?A) Decreased blood viscosityB) Decreased sympathetic cholinergic activityC) Increased sympathetic adrenergic activity D) Vasodilation in skeletal muscle
With recovery of arterial blood pressure following spinal cord transection, the recovered blood pressure tends to :-a- be higher than normalb- be lower than normalc- show abnormal oscillationsd- drop progressively
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Which of the following would result in higher force production at lower action potential frequencies W. increase SERCA activity X. increase DHPR sensitivity Y. increase acetylcholineesterase activity Z. increase Ca2+ release
What becomes active during a sag in neuron which is an indication of hyperpolarisation activated cation current?
During the refractory period a second action potential______. A cannot occur because voltage-gated Na+ channels are inactivated B cannot occur because the heart muscle cell has already returned to resting potential C can be initiated more easily because the threshold potential is reduced D can be initiated more easily because the calcium level in the sarcoplasm is increased
The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
Watch this animation (http://openstaxcollege.org/l/bloodflow1) to see how blood flows to the brain and passes through the circle ofWillis before being distributed through the cerebrum. The circle of Willis is a specialized arrangement of arteries that ensure constant perfusion of the cerebrum even in the event of a blockage of one of the arteries in the circle. The animation shows the normal direction of flow through the circle of Willis to the middle cerebral artery. Where would the blood come from if there were a blockage just posterior to the middle cerebral artery on the left?
Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?

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A B - 60mV -70 Refer to the figure of 3 action potentials. Which action potential(s) contain a calcium current? O C only O A only A and C O A, B and C B only B and C A and B