"Blood" PPT courseware download

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"Blood" PPT courseware download

Part One: Course Knowledge Points

Knowledge point 1 The composition and function of blood

1. Observe the composition of blood

Add a few drops of 5% sodium citrate solution into the graduated cylinder, then inject 10 mL of rabbit (or other mammal) blood, and shake the graduated cylinder gently. After letting it sit for a while, you can see that the blood in the measuring cylinder is clearly divided into two parts. The upper layer is a light yellow translucent liquid called plasma, which accounts for about 55% of blood. The lower layer is dark red, which are red blood cells. There is a thin layer of white material between the two layers, which is white blood cells and platelets.

2. Composition and functions of blood

[Example 1] (2017 Hunan Shaoyang High School Entrance Examination) Among the following four pictures, the one that can correctly express the relationship between the three concepts of blood, plasma, and blood cells is ()

Analysis Blood includes plasma and blood cells, and plasma and blood cells are in a parallel relationship.

Answer A

Knowledge Point 2 Plasma

1. Composition of plasma

Plasma contains a large amount of water (91% to 92%), protein (about 7%), glucose (about 0.1%), inorganic salts (about 0.9%), metabolic waste, etc.

2.Main functions of plasma

Carry blood cells, transport nutrients and waste products.

[Example 2] (2017 Hebei Cangzhou Simulation) The two most abundant substances in plasma are ()

A. Water and inorganic salts

B. Water and protein

C. Glucose and amino acids

D. Glucose and inorganic salts

Analysis: The most abundant substance in plasma is water, accounting for 91% to 92%; followed by protein, accounting for about 7%; glucose, amino acids, inorganic salts, metabolic wastes, etc. account for 1% to 2%.

Answer B

Blood PPT, Part 2 content: Examination points

Test points: Picture recognition questions of three types of blood cells

[Example] The picture on the right is the field of view of a human blood smear observed with a microscope. Which of the following statements is correct ()

A.①The smallest individual, able to penetrate blood vessel walls

B. ② The largest number and the ability to phagocytose germs

C.③ has the largest number and has the function of transporting oxygen

D. Among the three types of cells ①②③, only ③ has no nucleus

Analysis: ① Platelets are the smallest individual blood cells. They have no nucleus and cannot penetrate the blood vessel wall; ② They are spherical, have nuclei and are the largest individuals. They are white blood cells, the smallest number of blood cells and can phagocytose germs; ③ They are round cakes with two concave sides. They are red blood cells and have no nucleus. They are also the most numerous blood cells and have the function of transporting oxygen.

Answer C

Blood PPT, Part 3: Detailed explanation of textbook questions

Demonstrate the key points of observing the composition of blood

1.How many colors are there in the blood in the measuring cylinder?

Tip: The blood in the measuring cylinder has three colors, the upper layer is light yellow translucent liquid, the lower layer is dark red and the middle is a thin layer of white substance.

2. According to the color of the blood in the measuring cylinder, how many parts can the blood be divided into? What is the approximate proportion of each part to the total volume?

It reminds you that blood can be divided into two parts. The upper light yellow translucent liquid is plasma, accounting for about 55% of the total volume. The lower dark red part and the thin layer of white material in the middle are blood cells, accounting for about 45% of the total volume. .

Activity "Observing Blood Cells" Discussion Questions

1. Why is blood red? What cells in the blood is it related to?

Tip: Blood appears red because it contains red hemoglobin, which is related to red blood cells.

2. Compare the differences in shape, structure and number between red blood cells and white blood cells.

Tips: Mature red blood cells are round cake-shaped with two central foveations, red, without nuclei, and numerous in number, and can be observed without staining; white blood cells are larger than red blood cells, have nuclei, and are small in number, and can only be observed clearly after staining.

Keywords: Beijing Normal University Edition Biology PPT courseware for seventh grade volume 2 free download, blood PPT download, .PPT format;

For more information about the PPT courseware "Material Transport Blood in the Human Body", please click the "Material Transport Blood ppt in the Human Body" tab.

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Update Time: 2024-10-04

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