The structure of the human heart is mainly made of four chambers. The four chambers are two atria and two ventricles all of which are responsible for receiving blood from the body and pumping it back to the body. .
The immediate protector of the heart is the pericardium, which is the sac that surrounds the heart. The heart is also protected by muscle, bone, and skin.
Pericardium Pericardium
the heart structure is the way that the heart is built and shaped but the parts of the heart is whats in the the heart and what the heart is made out of.
The heart cell structure is just like most body cells. It is different in the way it works. It shows autorhythmisty as they beat on their own without nervous system stimulation.
Typically referred to as a blood vessel. A tube like structure that carries blood to the heart.
Heart Disease
Because collectively they enclose the heart and lungs in a cage like structure.
The heart is oxygenated by capillaries surrounding it just like every other organ
The smallest animal with a heart is the jellyfish, particularly species like the "miniature jellyfish" (such as those in the genus Eirene). While jellyfish lack a centralized circulatory system and a traditional heart, they possess a simple structure that functions similarly by pumping nutrients and gases through their body. However, if you're considering animals with a more defined heart structure, the heart of a small fish, like the Paedocypris progenetica, might also be considered, as it is one of the smallest vertebrates with a heart.
heart valves
I believe it is the ventricles. It collects and expels blood. It is like an automatic door that closes and shuts itself.
A structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it