Structures of the heart.

The heart is a muscular organ located in the chest that pumps blood throughout the body to supply oxygen and nutrients and remove waste products such as carbon dioxide.
In humans, the heart is roughly the size of a large fist and weighs around 250 - 300 grams.

The human heart has four main chambers:

• two upper chambers (the atria)
• and two lower chambers (the ventricles)

The right atrium and right ventricle together make up the "right heart," and the left atrium and left ventricle make up the "left heart."
A fibrous septum separates the two sides of the heart.

Blood travels in the vasculature (blood vessels) to and from the heart.
Vessels in the 3d application will be color coded to distinguish between types of vessels.(arteries: RED and veins: BLUE). The 4 main chambers are coloured orange.

Main components of the heart.

• Atria: Smaller and more superior chambers.
• Ventricles: Larger and most inferior chambers of the heart.
• Major arteries transports blood away from the heart.
• Major veins transports blood towards the heart.
• Pulmonary vessels connect with the hilum of the lungs.
• The aorta transport the systemic blood while
• the venae cavae (major veins) return the systemic deoxygenated blood to the heart.

Facts

The ventricles contain approximately 130 mL blood at the end diastolic volume (EDV) or preload (at the end of atrial systole and just prior to atrial contraction).
Roughly 50% to 75% of the preloaded blood is ejected during systole (contraction).
The human heart beats around 100,000 times a day, pumping approximately 60 - 80mL of blood each beat (1800 to 2,000 gallons) per day.