Sphincters in microcirculation help divert blood to areas that need it most.

Cardiac muscle contraction is influenced by action potentials at the cellular level.

Unidirectional blood flow in the heart is maintained by the valves.

The heart contracts through a process involving calcium ions.

Valve disease does not affect the flow of blood in the heart.

The cardiac cycle includes both the systolic and diastolic phases.

Heart failure is often due to issues with the heart's pumping ability.

Smooth muscle cells and cardiac muscle cells have identical functions.

The heart's electrical signals originate in the AV node.

Coronary bypass is used to treat blocked coronary arteries.

Blood flow direction in the heart follows a specific path during the cardiac cycle.

Volume changes in the heart are irrelevant to cardiac function.

Microcirculation does not involve the use of sphincters.

The heart does not require oxygen for its function.

Action potentials do not play a role in heart contractions.

Heart valves contribute to minimizing friction within the heart.

Valve diseases can lead to improper blood flow within the heart.

Cardiac myocytes undergo stretching patterns during contraction.