The relative abundance of C plant species increases with latitude because of the associated temperature gradient. A study in North America found that at  42°  North,  C3  plants  become more  abundant than  C4  plants. Given  an  increase in  mean global  temperatures by  10°C and no  other changes in  environmental conditions,  the latitude at which C3 plants become more abundant:

#Question id: 11012

#Unit 7. System Physiology – Animal

If the Purkinje fibers, situated distal to the A-V junction, become the pacemaker of the heart, what is the expected heart rate?

#Question id: 11015

#Unit 7. System Physiology – Animal

A 65-year-old man had an EKG recorded at a local emergency room following a biking accident. His weight was 80 kg and his aortic blood pressure was 160/90 mm Hg. The QRS voltage was 0.5 mV in lead I and 1.5 mV in lead III. What is the QRS voltage in lead II

#Question id: 11016

#Unit 7. System Physiology – Animal

A ventricular depolarization wave when traveling −90° in the frontal plane will cause a large negative deflection in which lead?

#Question id: 11017

#Unit 7. System Physiology – Animal

Which of the following is most likely at the “J point” in an EKG of a patient with a damaged cardiac muscle?

#Question id: 11018

#Unit 7. System Physiology – Animal

A 50-year-old man has a blood pressure of 140/85 and weighs 200 lb. He reports that he is not feeling well, his EKG has no P-waves, he has a heart rate of 46, and the QRS complexes occur regularly. What is his likely condition?

#Question id: 11019

#Unit 7. System Physiology – Animal

An 80-year-old man had an EKG taken at his local doctor’s office, and the diagnosis was atrial fibrillation. Which of the following statements are likely conditions in someone with atrial fibrillation?