"Pipelines for Blood Flow - Blood Vessels" Transport of Materials in the Human Body PPT Courseware 3

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"Pipelines for Blood Flow - Blood Vessels" Transport of Materials in the Human Body PPT Courseware 3

teaching objectives:

1. Describe the structural and functional characteristics of arteries, veins, and capillaries.

2. Try to distinguish between these three types of blood vessels and the flow of blood within these three types of blood vessels.

The heart and blood vessels throughout the body form a closed system of tubes in which blood flows. The power of flow comes from the beating of the heart.

Experiment: Observe the blood flow phenomenon in the tail fin of small fish

Method steps:

1. Wrap small fish

Wrap the gill cover and trunk of the small fish with soaked gauze, exposing the tail

2. Place small fish

Place the small fish on its side in the petri dish, with the tail fin flat against the bottom of the petri dish (the fish head is facing forward)

3.Observe

Place the culture dish on the stage and observe the blood flow with a low-power microscope

Note: Keep the gills of small fish moist; keep the tail fin flat against the petri dish; keep the stage and lens clean.

discuss:

1. How many types of blood vessels did you observe? Is the blood flow velocity in these blood vessels the same?

2. Can you differentiate between several different blood vessels?

Reference answer:

1. Three types of blood vessels, arterioles, venules and capillaries, can be observed. Blood flows at different speeds in these three types of blood vessels: fast in arterioles, slow in venules, and slowest in capillaries.

2. Generally, three types of blood vessels (arterioles, capillaries and venules) can be distinguished.

explore

[Question]What is the blood flow speed in the three types of blood vessels? What is the direction of blood flow in blood vessels?

Hypotheses were made based on the structural characteristics and definitions of the three blood vessels.

[Assumption] The speed of blood flow in arterial tubes is fast, the speed of blood flow in venous tubes is slow, and the speed of blood flow in capillaries is the slowest; the direction of blood flow is: from arteries → capillaries → veins.

[Design and complete experiments]

Design: Observe the blood flow of the tail fin of small fish to verify your judgment

Observe the pictures of the three types of blood vessels and think about them in combination with the book:

1. How are arteries and veins defined?

2. What is the direction of blood flow in arteries and veins?

3. Analyze and compare the thickness of the wall and the size of the lumen of the three blood vessels from the pictures. What are the differences?

The functions of the venous valves of the limbs:

The muscles contract and squeeze the veins (the vein walls are very thin and are easily squeezed). At this time, the blood between the two venous valves is divided into two parts. The blood in the upper part opens the vein valve and continues to flow upward. The blood in the lower part is due to When gravity decreases, the venous valves close and remain in the blood vessels; the muscles relax, the pressure decreases, and the blood pressure in the lower segment is high. The venous valves open and the blood flows forward. This ensures that the blood is returned to the direction of the heart without flowing back.

1. Will you choose?

1. When observing the blood flow in the tail fin of a small fish, the observation tool should be ( )

A. Magnifying glass B. Low-magnification microscope C. High-magnification microscope D. Electron microscope

2. The "cut" in "looking, smelling, asking, and feeling" in Chinese medicine refers to counting the pulse. The pulse here is ( )

A. Capillaries B. Veins C. Arteries D. Meridians

3. The place where substances are exchanged between blood and tissue cells is ( )

A. arteries B. veins C. capillaries D. heart

4. Someone’s thigh is injured and bleeding, and the blood flow is like a spurt. Do you think the injured blood vessel is ( )

A. Small vein B. Large vein C. Small artery D. Large artery

5. After bleeding from the following blood vessels, which one can stop bleeding naturally ( )

A. Artery injury and bleeding B. Capillary injury and bleeding

C. Venous injury and bleeding D. Injury and bleeding at the junction of veins and capillaries

6. The blood vessel that red blood cells cannot pass through side by side is ( )

A. Arteries B. Veins C. Capillaries D. All of the above blood vessels

2. Judgment

1. Arterial blood flows in arteries, and venous blood flows in veins. ( )

2. Arteries and capillaries can be found on the surface of the body. ( )

3. The color of blood flowing in veins and arteries is the same. ( )

3. Fill in the blanks

Arteries are blood vessels that carry blood from _____ to various parts of the body. The _____ of arteries are thick and elastic, and the speed of _____ in the tubes is fast.

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For more information about the PPT courseware "Pipes and Blood Vessels for Transporting Substances in the Human Body and Blood Flow", please click on the Pipes and Vessels for Blood Flow ppt tag.

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Update Time: 2024-11-19

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