| Category | Format | Size |
|---|---|---|
| People's Education Press Sixth Grade Science Volume 1 | pptx | 6 MB |
"Blood Circulation in the Human Body" PPT courseware on the mysteries of the human body
Description
"Blood Circulation in the Human Body" PPT courseware on the mysteries of the human body
The normal life of cells in the human body requires the intake of various nutrients and the elimination of metabolic waste. The transport of nutrients and metabolic wastes relies on the circulatory system. The circulatory system mainly refers to the blood circulation system. How is the blood circulation system structured? How does it transport nutrients and oxygen that the human body obtains from the outside world to tissue cells? How are waste products such as carbon dioxide produced by cells transported away?
Objectives of this section:
1: Master the components and functions of blood.
2: Can distinguish three types of blood vessels.
Three: Understand the structure of the heart.
Four: Be able to describe the pathways of blood circulation.
Comparison of blood cell characteristics
Morphological and functional characteristics
red blood cells
1. Mature seedless, round cake shape.
2. Contains hemoglobin, which appears red and can transport oxygen.
3. Too few red blood cells or hemoglobin can cause anemia.
leukocyte
1. Larger than red blood cells.
2. There are many types of seeds.
3. Some can eat germs.
platelets
1. The smallest size and no core.
2. Can stop bleeding and accelerate blood clotting.
self-test
1. The blood vessel connected to the left atrium is ( )
A. Aorta B. Pulmonary artery C. Pulmonary vein D. Vena cava
2. The thickest myocardial wall is ( )
A. Left ventricle B. Right ventricle C. Left atrium D. Right atrium
3． The function of the heart valve is to ensure the direction of blood flow from ( )
A. Atrium → Ventricle → Artery B. Atrium → Ventricle → Vein
C. Ventricle → Atrium → Artery D. Vein → Ventricle → Atrium
Four: blood circulation
The heart beats continuously, causing blood to circulate in the closed tube composed of the heart and all blood vessels. This process is blood circulation. About 10,000L of blood flows through the heart day and night.
The human blood circulation system consists of the heart, arteries, capillaries and veins. Blood circulates in blood vessels throughout the body.
According to the different blood circulation pathways of the human body, blood circulation can be divided into two parts: systemic circulation and pulmonary circulation.
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Update Time: 2024-06-29
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