"Flowing Tissue-Blood" Transportation of Materials in the Human Body PPT Courseware

"Flowing Tissue-Blood" Transportation of Materials in the Human Body PPT Courseware

teaching objectives:

1. Describe the components and main functions of blood.

2. Use a microscope to look at a permanent smear of human blood and try to identify red blood cells and white blood cells.

You usually don’t feel it, but there are busy transport lines in your body. They quickly transport nutrients from the digestive tract and oxygen from the lungs to every cell in your body, and at the same time, they transport waste products produced in cellular life. Shipped away in time. These transportation lines are large and small blood vessels throughout the body, and blood flows in the blood vessels.

Analyze the following information.

1. Put a certain amount of human blood into a test tube filled with anticoagulant, and after centrifugation with a centrifuge or letting it sit for a period of time, you can observe obvious stratification of the blood (see the picture on the right).

2. When people go to the hospital to see a doctor, they sometimes need to do routine blood tests. Changes in the patient's blood components can be used as a reference for diagnosing the disease. Please read the following blood routine test sheet, focusing on the "Items" and "Measurement Values" columns.

Note: RBC, WBC, Hb, and PLT in the report form are the English abbreviations of red blood cells, white blood cells, hemoglobin, and platelets respectively.

discuss:

1. Why does blood containing anticoagulants stratify after centrifugation or standing for a period of time? How many layers does it separate into?

Blood contains different components and their qualities are different. Therefore, after centrifugation or standing for a period of time, blood containing anticoagulants will gradually divide into two layers, upper and lower, and a thin layer of white substance in the middle.

2. Based on the above information, what parts do you think blood may be composed of? At what levels should the blood components listed on the routine laboratory test sheet be located?

Blood is composed of an upper layer of light yellow translucent liquid, a lower layer of dark red liquid, and a thin layer of white material in the middle. The red blood cells and the hemoglobin they contain are in the lower layer of material, and the white blood cells and platelets are in the thin layer of white material in the middle.

3. Why is blood called “flowing tissue”?

There are a large number of blood cells in the blood. These cells and plasma together constitute the blood and complete functions such as material transportation. Therefore, the blood is a kind of tissue and belongs to the connective tissue. Blood can flow, hence the name "fluid tissue."

Composition and functions of blood

plasma

Ingredients: water, glucose, amino acids, inorganic salts, plasma protein, urea, etc.

Function: Carry blood cells, transport nutrients and waste products produced in the body

blood cells

Red blood cells function: transport oxygen

White blood cell function: phagocytosis of bacteria, immune function

Platelet functions: coagulation, hemostasis

After-class exercises P71

1. When people sweat profusely or have severe diarrhea, what are the main components lost in the blood? What methods are usually used to replenish these components lost in the blood?

During heavy sweating, the blood mainly loses water and inorganic salts. Drinking water and appropriate amounts of inorganic salts are usually used to replenish these components lost in the blood. In severe diarrhea, the human body mainly loses nutrients such as water, some inorganic salts, and glucose. Methods such as drinking water, supplementing appropriate amounts of inorganic salts, and intravenous drip (or oral) glucose solution are usually used to replenish these components lost in the blood.

2. Anemia occurs when there are too few red blood cells or hemoglobin in the body. What symptoms do you think patients with anemia will exhibit? Depending on the composition of the hemoglobin, what can be done to alleviate these symptoms?

The symptoms of anemia patients are: pale complexion and dizziness, fatigue, palpitations, impatientness and other symptoms. Hemoglobin is an iron-containing protein. Generally speaking, patients with anemia should eat more iron-containing foods and protein-rich foods.

Class exercises

1. Which of the following groups contains substances that should not be present in plasma ( )

A. Water, enzymes, inorganic salts, platelets

B. Vitamins, glucose, hormones

C.Amino acids, carbon dioxide, plasma proteins

D. Oxygen, urea, phospholipids

2. Arterial blood is red mainly because it contains more ( )

A. Red blood cells B. Hemoglobin combined with oxygen

C.Nutrient D.Carbon dioxide

3. Use a microscope to observe the blood smear. The largest number of cells seen in the same field of view is ( )

A. White blood cells B. Red blood cells C. Platelets D. Lymphocytes

4. Which of the following cells can swim in tissue fluid ( )

A.Red blood cells B.Adipocytes

C. White blood cells D. Sperm cells

5. The group of mature blood cells in the human body that does not have a nucleus is ( )

A. Red blood cells and white blood cells B. Platelets and white blood cells

C. Platelets and red blood cells D. Blood cells and red blood cells

6.Anemia refers to ( )

A. Too little blood in the human body

B. Too few nutrients in the blood

C. Too few white blood cells or platelets in the blood

D. The number of red blood cells in the blood is too low, or the hemoglobin content in the red blood cells is too low.

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