18. The Heart

Which feature of cardiac tissue allows for the rapid spread of action potentials through the heart?

Which statement best describes intrinsic conduction of the heart?

The intrinsic conduction system ensures a coordinated and efficient heartbeat. If the sinoatrial (SA) node malfunctions, which part of the heart’s conduction system is most likely to take over as the pacemaker?

Which answer choice below correctly matches the cardiac conduction structure to where it’s found in the heart?

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?

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

Why is autonomic tone a significant part of ANS function?