Ranjeet
Heart: As all we know that heart is a essential part of the body in our circulatory system. it is made of Cardiac Muscle and is covered from Pericardium Membrane.
Its main function is to pump the blood in the body instead of falling in love with someone. it pumps the blood at the rate of 120 BP and receives it at 80 BP (120/80 BP).
There are three types of circulatory system.
- Open Blood Circulatory system: In this system blood flows without pressure. Exp- Arthropoda, Snail.
- Closed Circulatory System: In this system blood flows through the veins and arteries with constant speed and pressure. It is found in all the Mammals and Annelida.
- Mixed Circulatory System: In this system blood flows sometimes at constant pressure and sometimes flows in opposite direction. it is found in Fishes and Frogs.
let’s see how does the HEART function in our body but before this we have to understand some key points.
There are two blood vessels (artery and veins) which transport the blood in our body one place to another. please see the below.
1.Heart chambers. the empty space found in the heart is called heart chamber. there are two types heart chambers.
2. Atrium: It is a upper part of the heart. the blood enters in heart through this way. it is also has two types (left atrium and right atrium).
3. Ventricle: It is lower part of heart it pumps the blood to whole body’s parts.
4. Capillary: it is a thin vein. it is blood junction point in our body where the pure and impure blood meet each other..
6. Valve: It is just like a door in heart between its chambers.
there are valves found between these chambers as shown in the below picture.
- Right Atrium & Right Ventricle: BICOSPID VALVE
- Left Atrium & Left Ventricle: TRICOSPID VALVE OR MITRAL VALVE
Function of Heart:
Firstly when impure blood enters in Right ATRIUM chamber of heart by the Ven cave, it simply passes through the whole blood into Right VENTRICLE through DICOSPID VALVE. then right ventricle sends all the impure blood to the LUNG through the PULMONARY artery. Lung purifies all the blood by mixing oxygen (O2) and restricting Carbon die oxide (CO2) from it.
Now the pure blood enters into Left Atrium through Pulmonary vein. left atrium leaves all the blood into the left ventricle.
Left ventricle is the widest chamber of heart. it sends all the blood in our whole body parts through the Aorta artery with full pressure.
Coronary sinus vein carries the blood to the heart muscles. when the quantity of COLESTROL which is type of FAT increases in this vein, it causes heart stroke or heart attack.
Stethoscope is used to measure the heart bit, with the help of stethoscope doctor hears the sound of heart (LAV-DAV). it works on principle of sound.
Heart beats 72 times in a minute. as 5 liters of blood are found in men and 4.5 liters of blood are found in women, 70ml of blood passes through the body by one heart bit so to pass the whole blood in the found the heart has to beat 72 times in a minute.
Pace Maker which is found in Right Atrium controls the heart beat.
Fishes have only chambers in their heart.
Amphibian like frogs, reptiles have three chambers in heart but in crocodile, Alligator and birds there are four chambers.
Way of blood in body…….
