Describe the pericardium and distinguish between the fibrous and the serous pericardia relative to histological structure and location.

The contractile cardiac muscle fibers of the myocardium behave as a single, coordinated unit called a __________.

Which of the following factors gives the myocardium its high resistance to fatigue?

The autonomic division of the nervous system directs (a) voluntary motor activity, (b) conscious control of skeletal muscles, (c) unconscious control of skeletal muscles, (d) processes that maintain homeostasis, (e) sensory input from the skin.

Which four ganglia serve as origins for postganglionic fibers involved in control of visceral structures in the head?

Why is autonomic tone a significant part of ANS function?

The role of the atrioventricular node (AV node) is to __________.

Choose the correct sequence of electrical current flow through the heart wall.