What is the substance that, after being separated by a centrifuge, is divided into three layers?

Release time:

2014-10-12

Overview:

Blood consists of formed elements and plasma. The formed elements (blood cells) make up 45% of blood and include three main types.

Components of blood: Blood consists of formed elements and plasma. The formed elements (blood cells) make up 45% of the blood and include three main types.

1. Red blood cells are the most abundant of the formed elements in blood. They are small, round, and flattened, with thick edges and a central indentation. They lack a nucleus and their primary component is hemoglobin. A key characteristic of hemoglobin is that it readily binds to oxygen in areas with high oxygen concentration and easily releases oxygen in areas with low oxygen concentration. Thus, its primary function is to transport oxygen. Hemoglobin has a red color, and the degree to which it binds to oxygen determines its hue: arterial blood, rich in oxygen, appears bright red, while venous blood, containing less oxygen, appears dark red.

2. White Blood Cells: White blood cells are colorless, nucleated, round-shaped cells that are slightly larger than red blood cells. The normal range for white blood cell count is approximately ---------- per liter of blood. There are various types of white blood cells, including granulocytes and lymphocytes, each accounting for a specific proportion in the bloodstream. When a person is ill, the proportions of these cells may change, making them valuable reference data for diagnosing diseases.

3. Platelets: Platelets are tiny, nucleus-free cell fragments whose primary function is to promote blood clotting. There are approximately --- platelets per liter of blood. When their number drops below a certain threshold, bleeding tends to occur easily in the skin, mucous membranes, internal organs, and other areas.

In addition to the formed elements, the remaining portion of blood is called plasma. Plasma is the liquid component of blood. It contains many important substances, including proteins, inorganic salts (such as potassium, sodium, and calcium), antibodies, and hormones. Water makes up 91% to 92% of plasma. The digestive process of eating a steamed bun is as follows: First, it’s broken down into maltose in the mouth; then, it moves to the stomach for further chewing; finally, it enters the small intestine, where most of the nutrients are absorbed and digested.

Tender Notice for Floor-Standing High-Speed Refrigerated Centrifuge at the First Affiliated Hospital of Zhejiang University School of Medicine

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