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BIO 420 Mammalian Physiology
Homework #3
Fall 2015
Name: _________________________
1. What are the characteristics of cardiac muscle cells which distinguish them from skeletal muscle, and
how do these contribute to their ability to perform functions specific to the myocardium? (3 pts)
2. How does autonomic regulation affect cardiac output? (3 pts)
3. What would an ECG tracing look like in a patient with 3rd degree AV block, and what problem with the
electrical conduction system would lead to this condition? Why wouldn’t this patient be dead? (2 pts)
4. What is the main contributor to changes in rate of flow, based on Poiseuille’s law? What does this
mean physiologically, in terms of how local tissue blood flow (perfusion) is regulated? (2 pts)