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"Blood" PPT download
Part One: Composition of Blood
1. Observe the phenomenon of blood stratification.
2. Name the composition of blood.
3. Composition and functions of plasma
blood stratification phenomenon
Take a look. How many colors are there in the blood in the measuring cylinder? What are the differences?
Think about it: What is blood made of? The proportion?
Part 2: Composition and functions of blood
(1) Plasma
1. Ingredients: A large amount of water (about 91% to 92%), protein (about 7%), glucose (about 0.1%), inorganic salts (about 0.9%), metabolic waste, etc.
2. Function: Carrying blood cells, transporting nutrients and metabolic waste.
3. Serum: plasma without fibrinogen.
red blood cells
1. Characteristics of red blood cells.
2. Characteristics of hemoglobin.
3. Function of red blood cells.
4. Causes and treatments of anemia.
white blood cells and platelets
1. White blood cells have ___ nuclei and are individually ____ than red blood cells.
2. When inflammation occurs in the human body, the number of white blood cells ____.
3. Function of white blood cells: __________.
4. The shape of platelets is _______, ___nucleus, and individual _______ than that of red blood cells.
5. The function of platelets is ________.
(2) White blood cells (P28)
1. Quantity: (4～10)×109 pieces/L
2. Morphological and structural characteristics:
There is a nucleus, often divided into leaves, and some white blood cells can perform deformation movements.
3. Lifespan: Varies (new cells are produced from red bone marrow).
4． Function: Phagocytosis of germs, etc. (i.e. protection and defense function).
(3) Platelets (P28)
1. Morphological characteristics: irregular shape, smaller than red blood cells and white blood cells, no nucleus.
2. Quantity: (1～3)×1011 pieces/L
3. Function: Hemostasis and coagulation
Hemostasis: gathers in wounds and blocks blood vessels.
Coagulation: Release of procoagulant substances that turn soluble fibrinogen into insoluble fibrin.
[Note] Plasma that does not contain fibrinogen is called serum!
There is a difference between blood, plasma and serum!
Part 3: After-class exercises
1. Please connect the following blood components with their functions.
aPlasma ①Carries oxygen
bRed blood cells ②Transport nutrients and waste
c white blood cells ③Hemostasis, coagulation
d platelets ④phagocytosis of germs
2. The most abundant substance in plasma is ( )
A.Water
B.Protein
C.Glucose
D.Inorganic salt
3. The combination and separation of hemoglobin and oxygen depend on () in the blood
A. How much carbon dioxide
B.How much oxygen
C. The amount of hemoglobin
D.The number of red blood cells
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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