Question

explain the process taking place by heart in our body...... ​

Answer 1

Answer:

The pulmonary artery is a big artery that comes from the heart. It splits into two main branches, and brings blood from the heart to the lungs. At the lungs, the blood picks up oxygen and drops off carbon dioxide. The blood then returns to the heart through the pulmonary veins.

In systemic circulation:

Next, blood that returns to the heart has picked up lots of oxygen from the lungs. So it can now go out to the body. The aorta is a big artery that leaves the heart carrying this oxygenated blood. Branches off of the aorta send blood to the muscles of the heart itself, as well as all other parts of the body. Like a tree, the branches gets smaller and smaller as they get farther from the aorta.

At each body part, a network of tiny blood vessels called capillaries connects the very small artery branches to very small veins. The capillaries have very thin walls, and through them, nutrients and oxygen are delivered to the cells. Waste products are brought into the capillaries.

Capillaries then lead into small veins. Small veins lead to larger and larger veins as the blood approaches the heart. Valves in the veins keep blood flowing in the correct direction. Two large veins that lead into the heart are the superior vena cava and inferior vena cava. (The terms superior and inferior don't mean that one vein is better than the other, but that they're located above and below the heart.)

Once the blood is back in the heart, it needs to re-enter the pulmonary circulation and go back to the lungs to drop off the carbon dioxide and pick up more oxygen.

How Does the Heart Beat?

The heart gets messages from the body that tell it when to pump more or less blood depending on a person's needs. For example, when you're sleeping, it pumps just enough to provide for the lower amounts of oxygen needed by your body at rest. But when you're exercising, the heart pumps faster so that your muscles get more oxygen and can work harder.

How the heart beats is controlled by a system of electrical signals in the heart. The sinus (or sinoatrial) node is a small area of tissue in the wall of the right atrium. It sends out an electrical signal to start the contracting (pumping) of the heart muscle. This node is called the pacemaker of the heart because it sets the rate of the heartbeat and causes the rest of the heart to contract in its rhythm.

These electrical impulses make the atria contract first. Then the impulses travel down to the atrioventricular (or AV) node, which acts as a kind of relay station. From here, the electrical signal travels through the right and left ventricles, making them contract.

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Answer 2

✔️✔️✔️️heart is divided into four chambers:-

➖right auricle

➖ right ventricle

➖left auricle

➖ left ventricle.

⭕️The walls of the chambers are made up of a special muscle which contracts continuously and rhythmically to distribute blood to all the body cells.

✔️✔️✔️Working of heart

⭕️The heart has superior and inferior vena cava which carry deoxygenated blood from the upper and lower regions of the body and supply the deoxygenated blood to the right auricle of the heart.

⭕️The right ventricle contracts and passes the deoxygenated blood into the two pulmonary arteries, which pumps it to the lungs where the blood is oxygenated.

⭕️From the lungs, the pulmonary veins transport the oxygenated blood to the left atrium of the heart.

⭕️The blood passes to aorta from the left ventricle.

⭕️The left atrium contracts and the oxygenated blood enters the left ventricle.

⭕️ The aorta gives rise to many arteries that distribute the oxygenated blood to all the regions of the body.

⭕️here since the blood goes twice through the heart, it is known as "double circulation".

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