If we could artificially alter the membrane permeability of pacemaker cells so that potassium efflux was decreased compared to normal circumstances, what would be the result?

Dr. Hansen goes to the doctor for her routine annual physical. The exam begins with the nurse taking her vitals. Her blood pressure is 109/73. Her heart is beating 68 times per minute. Prior to each contraction, there is 156 ml of blood in her left ventricle, and 62 ml remains in the ventricle after the heart contracts.

During isovolumetric contraction, ________.

The research lab you work in is studying adaptations in muscle fibers of sprinters. You are asked to analyze a muscle biopsy from the leg of an Olympic sprinter. Because of her training, you expect the majority of the fibers from the sprinter’s leg to exhibit which set of the following characteristics?

How would a decreased venous return affect mean arterial pressure?

How would an increased diameter of arterioles affect mean arterial pressure?

Which of the above steps is disrupted by the autoimmune disease myasthenia gravis?

In comparison to the pulmonary circuit, the systemic circuit ________.

Which of the following is NOT a property of oxidative fibers compared to glycolytic fibers?

Ejection of blood from the left ventricle will continue until ________.