An 8-year-old male is frequently coming to the clinic for persistent skin infections that do not heal within a normal time frame. He had a normal recovery from the measles. Checking his antibodies following immunizations yielded normal antibody responses. A defect in which of the following cells would most like be the cause of the continual infections?

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#Question id: 10986

#Unit 7. System Physiology – Animal

Which of the following conditions at the A-V node will cause a decrease in heart rate?

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#Question id: 10987

#Unit 7. System Physiology – Animal

If the ventricular Purkinje fibers become the pacemaker of the heart, what is the expected heart rate?

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#Question id: 10988

#Unit 7. System Physiology – Animal

What is the normal total delay of the cardiac impulse in the A-V node and the A-V bundle system?

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#Question id: 10989

#Unit 7. System Physiology – Animal

What is the resting membrane potential of the sinus nodal fibers?

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#Question id: 10990

#Unit 7. System Physiology – Animal

Sympathetic stimulation of the heart normally causes which of the following conditions?

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#Question id: 10991

#Unit 7. System Physiology – Animal

When recording lead I on an EKG, the right arm is the negative electrode, and the positive electrode is the