5. Explain the structure of heart?
Answers
Sol: Heart is the central organ for pumping the blood throughoutt he body. It is located in the chest cavity with its lower part pointing towards the left. Its size is that of the person’s fist. *It pumps blood rich in carbon dioxide to the lungs and oxygen-rich blood to other parts of the body. *The heart consists of four chambers namely atria and ventricles. The two upper chambers of the heart are known as the atria. The two lower chambers of the heart are the ventricles. *The deoxygenated blood is completely separated from the oxygenated blood completely. The atria and ventricles are separated by many types of valves which prevent the mixing up of pure blood from that of impure blood. *Heart is made up of strong cardiac muscles. The rhythmic contraction and relaxation of the heart constitutes heartbeat. *Heartbeat can be recognized by placing the palm on the left side of the chest. Stethoscope is a device that amplifies the sound of your heartbeat. *The pressure applied by blood on the walls of an artery at a particular part is the pulse. The number of times the heart beats in a minute is the same as the pulse rate.The ideal pulse rate is 70 to 80 per minute.
Answer:
The human heart is one of the most important organs responsible for sustaining life. It is essentially a muscle, about the size of a clenched fist.
The human heart functions throughout a person’s lifespan, pumping almost 200 million liters of blood. A human heart roughly beats 2.5 billion times during a human lifespan, making it one of the most robust and hardest working muscle in the human body.
Besides humans, most other animals also possess a heart that pumps blood throughout their body. Even invertebrates such as grasshoppers possess a “heart”, though they do not function the same way a human heart does.
Position of Heart in Human Body
The human heart is located between the lungs, behind and slightly towards the left of the sternum (breastbone). Two-thirds of the heart is situated on the left side of the chest, and the remaining part is balanced on the right side of the chest.
The Function of Heart
The function of the heart in any organism is to maintain a constant flow of blood throughout the body. This replenishes oxygen and circulates nutrients among the cells and tissues. Also, because the human heart is a homologous organ, it functions no differently from any other vertebrates that possess a heart. Following are the main functions of the heart:
One of the primary function of the human heart is to pump blood throughout the body.
Blood delivers oxygen, hormones, glucose and other components to various parts of the body, including the human heart.
The heart also ensures that adequate blood pressure is maintained in the body
There are two types of circulation within the body, namely pulmonary circulation and systemic circulation.
Explanation:
