The structure and anatomy of the heart
The heart is a muscular organ which is as big as our fist, the heart is located just behind and slightly left of the breast bone. The heart works like a pump, It pumps blood through the network of arteries and veins.arteris.veins and heart all together is called the transportation system of our body, because nutrients, water, oxygen and carbon dioxides are transported through the blood. Since Co2 and O2 are transported through the heart so it is designed to have four chambers.
The heart gets deoxygenated blood from all parts of the body and pumps out oxygenated blood to all parts of our body.
The heart has different chambers to prevent the oxygen rich blood from mixing with the blood containing carbon dioxide.
You can study how does the heart function through a step by step way.
1. Oxygen rich blood from the lungs comes to the thin walled upper chamber of the heart on the left, the left atrium.
2. The left atrium dilates when it is collecting the blood from the lungs. The left atrium then contracts while the next chamber, the left ventricle expands so that the blood transferred into it.
3. The left ventricle then contracts and thus blood is pumped out to the all body parts.
4. Deoxygenated blood comes from the body to the upper chamber on the right, the right atrium.
5. Right ventricle receives the deoxygenated blood through a valve from right atrium and then send it to the lungs through pulmonary artery for oxygenation of blood.
Structure Of Heart
Heart is made up of three layers of cardiac tissue
These layers are surrounded by the pericardium a thin outer lining protecting the heart. The two small upper chambers are artiums and the two larger lower chambers are the ventricles, there left and right sides of the heart are separated by a wall of muscle known as septum.
The mechanism of the heart
The right atrium receives deoxygenated blood from the veins, vencavas from upper and lower parts of the body and then pumps it to me right ventricle.
The right ventricle receives blood from the right atrium and pumps it to me lungs through the pulmonary artery
The left atrium receives the oxygenated blood from pulmonary veins. The right ventricle receives blood from the left atrium.,The right ventricle which is the strongest chamber of the heart creates our blood pressure due to vigorous contractions.
The right ventricle sends oxygen rich blood to all parts of body through aorta.the biggest artery of the circulatory system.
Q-How Does The Exchange Of Gas Takes Place In Fishes?
Ans. Fishes have only two chambers to their hearts and the blood is pumped to the gills, is oxygenated there and passes directly to the rest of the body. Thus, blood goes only once through the heart in the fish during one cycle of passage through the body.
Q-Why does not oxygenated blood and deoxygenated blood mix together in blood vessels or in heart ?
Ans.The oxygenated blood is received by left atrium through pulmonary vein then it is send to left ventricle through a valve that maintains unidirectional flow of blood then it is pumped out through the biggest blood vessel aorta .Deoxygenated blood is received by right atrium and then it is send to right ventricle through a valve between them making one directional flow of the blood. The left and right part of the heart is separated by a muscular layer known as the septum that prevents mixing of the blood. The base of palmonary vein,pulmonary artery and iorta are connected to the chambers of heart through the valves that prevent back flow of the current.