"Transportation of Substances in the Body" PPT (Lesson 1)

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"Transportation of Substances in the Body" PPT (Lesson 1)

Part One: Learning Objectives

1. Name the components of blood;

2. Outline the structure and function of red blood cells, white blood cells and platelets.

Why does excessive bleeding lead to death? For patients who have lost blood, why should blood transfusion be given instead of infusion? These are related to the composition and function of blood

Transport of substances in the body PPT, part 2: discussion

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

Because blood contains different components and their specific gravity is different, it will be stratified. Divided into two layers.

2. Why is blood called a "flowing tissue"?

There are a large number of blood cells in the blood. These cells and plasma form blood and complete functions such as material transportation. Therefore, blood is a kind of tissue and belongs to connective tissue. Because blood can flow, it is called a flowing tissue.

red blood cells

Biconcave disc shape

Mature red blood cells have no nucleus

hemoglobin

It easily combines with oxygen in places with high oxygen content, and easily separates from oxygen in places with low oxygen content.

Function: Transport oxygen and some carbon dioxide

PPT on the transportation of substances in the body, part 3: knowledge chain

Characteristics of red blood cells: Easily combine with oxygen in places with high oxygen content, and easily separate from oxygen in places with low oxygen content.

How much do you know about white blood cells?

1. Small quantity

2. Larger than red blood cells

3. White blood cells have nuclei

4. Has the functions of phagocytosis, defense and protection of germs

Transport of substances in the body PPT, Part 4: Class feedback

1. "Paternity test" requires DNA to be extracted from blood (existing in the nucleus), then DNA comes from blood components ( )

A. Red blood cells B. White blood cells

C. Platelets D. Hemoglobin

2. When a person is slightly injured and bleeds, he can automatically stop the bleeding. What is the blood component that plays an important role in this process ( )

A. Red blood cells B. White blood cells

C. Platelets D. Hemoglobin

3. 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

4.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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Update Time: 2024-11-22

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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