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Biology Seven Blood Circulation Handwritten Report

2026-09-24 17:49
2026-09-24 20:43

** Title: Blood Circulation ** ** 1. Discovering Blood Circulation ** In the early 17th century, William Harvey discovered the law of blood flow in the body. This discovery contradicted Galen's theory of blood flow that had been taught for centuries. Galen believed that the heart and liver produced blood and delivered it to various parts of the body. The blood was quickly exhausted and replaced. However, according to this view, a person had to produce a large amount of blood in a day. Inspired by the steam pump, Harvey believed that the heart was a pump made up of four chambers, and blood was constantly circulating through the body and lungs. ** 2. The process of blood circulation ** 1. ** Circulation ** - It starts from the left atrium. After the blood is pumped out of the left atrium, it flows through the main artery and its derived artery branches, sending blood to the corresponding organs. After the artery branches many times, the diameter becomes thinner and reaches the capillaries. Here, it exchanges substances with the tissue cells. The oxygen and nutrients are absorbed by the tissues, and the carbon dioxide and metabolism products enter the blood, turning the blood into venous blood. The diameter of the veins gradually became thicker and the number decreased. Finally, they gathered in the superior and inferior cava and returned to the right atrium. 2. ** Lung Circulation ** - Venous blood was pumped out of the right heart through the lung artery to reach the capillaries around the lungs, expelling carbon dioxide, absorbing oxygen, turning into artery blood, and then flowing back to the left atrium through the lung vein. 3. ** Cardiac Circulation ** - It was a cycle that provided nutrients and oxygen to the heart itself and carried away waste. Blood flowed from the coronaries at the base of the main artery to the capillaries inside the heart muscle, and finally returned to the right atrium through the veins. ** 3. The significance of blood circulation ** 1. ** Material Transportation and Metabolization ** - The body's nutrients reach all parts of the body through the blood circulation. The tissues obtain nutrients, water, and oxygen from the blood to produce heat energy to maintain normal functions. At the same time, waste products such as carbon dioxide, carboric acid, and uric acid produced by metabolism were discharged into the blood, which were transported to the respiratory organs and the excretory organs to be discharged from the body, maintaining the physical and chemical properties of the internal tissues relatively constant. 2. ** Body temperature regulation ** - Blood circulation could maintain a constant body temperature. The sugar and carbs in the blood can be converted into heat when the body temperature is low. When the surface of the skin is scalded or feels hot, the blood circulation will be accelerated. When the temperature is higher than the body temperature, the liquid can be cooled to dissipate heat. When the temperature is within the tolerance range, the blood circulation will be accelerated to accelerate metabolism. 3. ** Hormones Transport ** - The hormones secreted by the hormonal glands are transported to various parts of the body through circulation to regulate the physiological functions of the body. ** 4. Blood Circulation and Health ** 1. ** Leg blood circulation problem ** - The coldness and heaviness in her legs might be related to venous drainage. Age would cause the venous valve function to decline, and sitting for too long would also cause poor venous return. Blood circulation could be promoted through movements such as the ankle pump, such as stretching the feet in the supine position and then pushing down, bending the knees, bending the hips, pulling the lower limbs, and then stretching the calves to hook the feet. A series of actions could promote blood circulation in the lower limbs to return to the heart. 2. ** Ways to maintain healthy blood circulation ** - Physical exercise is beneficial to improving the function of the blood circulation system. For example, muscle contraction could promote blood circulation. For example, calf muscle contraction could help blood flow back to the heart. Read more exciting novels for free

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2026-09-24 18:17

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2026-09-24 18:17

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2026-09-24 18:16

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2026-09-24 18:16

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2026-09-24 18:16

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2026-09-24 18:15

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2026-09-24 18:15
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