Final answer:
The heart comprises the atria, ventricles, septum, and fibrous skeleton, each fulfilling various critical functions such as blood intake, pumping, internal separation of chambers, and structural support. All Option are correct.
Step-by-step explanation:
Structures Part of the Heart
The structures that are part of the heart include the atria, ventricles, septum, and the fibrous skeleton. Each of these plays a critical role in the heart's function. The heart is internally divided into four chambers: the right and left atria, and the right and left ventricles.
Blood enters the heart through the atria, which then pump it down into the ventricles. The ventricles are responsible for pumping the blood out of the heart. The septum refers to the walls or partitions dividing the heart into its respective chambers, such as the interatrial septum and the interventricular septum.
Last but not least, the fibrous skeleton of the heart consists of dense connective tissue that reinforces the septum and serves as the attachment point for the heart valves, playing an essential role in the heart's structural integrity and electrical conduction system.