Write the short note of heart
Answers
Explanation:
Heart is located in the center of the chest cavity slightly tilted towards the left. It is a hollow muscular organ made up of cardiac muscle fibres. It is the pumping organ of the circulatory system. It has four chambers, the right and left auricles (or atria) and the right and left ventricles. A wall separates the right and left halves of the heart. Auricles are thin-walled chambers that receive blood from the body. Each auricle passes on the incoming blood to the ventricle of its own side. The ventricles are thick-walled and pump blood out of the heart.
Heartbeat:
the heart beats rhythmically throughout one’s life. The periodic contraction and relaxation of the heart is called the heartbeat. The normal human heartbeat is 70-72 per minute. Doctors use a stethoscope to record the heartbeat. If you place your ear on your friend’s chest you would hear a thumping sound. These sounds are the heartbeats, which can be beard more clearly and loudly using stethoscope. The human heart pumps about 5 litres of blood per minute. This can increase to about 20 litres per minute during strenuous exercise.
Pulse:
Place your fingers over your wrist, just a little below your thumb. Your will notice a thumping just below the skin. This thumping sensation is the pulse. As the blood is pumped b the ventricles into the arteries with force, a wave of expansion passes along the arteries. This recorded in order to know the heartbeat. The pulse rate is the same as the rate of heartbeat, i.e., 70-72 per minute.
Answer:
The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system.[1] The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs.[2] In humans, the heart is approximately the size of a closed fist and is located between the lungs, in the middle compartment of the chest.[3]
Explanation:
In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles.[4][5] Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart.[6] Fish, in contrast, have two chambers, an atrium and a ventricle, while reptiles have three chambers.[5] In a healthy heart blood flows one way through the heart due to heart valves, which prevent backflow.[3] The heart is enclosed in a protective sac, the pericardium, which also contains a small amount of fluid. The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.[7]
The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node. These generate a current that causes contraction of the heart, traveling through the atrioventricular node and along the conduction system of the heart. The heart receives blood low in oxygen from the systemic circulation, which enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. From here it is pumped into the pulmonary circulation, through the lungs where it receives oxygen and gives off carbon dioxide. Oxygenated blood then returns to the left atrium, passes through the left ventricle and is pumped out through the aorta to the systemic circulation−where the oxygen is used and metabolized to carbon dioxide.[8] The heart beats at a resting rate close to 72 beats per minute.[9] Exercise temporarily increases the rate, but lowers resting heart rate in the long term, and is good for heart health.[10]