"The Pump that Transports Blood - Heart" Transport of Materials in the Human Body PPT Courseware 2

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"The Pump that Transports Blood - Heart" Transport of Materials in the Human Body PPT Courseware 2

Pre-class quiz

1. The "green veins" that bulge on the skin of our body are actually ()

A. ArteriesB. Vein C. Capillaries D. nerve

2. The basis for identifying capillaries under a microscope is ()

A. The tube wall is the thinnest B. The inner diameter of the tube is the smallest

C． Blood vessels connecting the smallest arteries and veins D. Red blood cells pass through in a single file

3． What do you think arteries and blood vessels are ( )

A. Large lumen and slow blood flow

B. Red blood cells pass through the tube in a single file

C． Transports blood from the heart to all parts of the body

D． Return blood from all parts of the body to the heart

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

A. ArteriesB. Vein C. Capillaries D. heart

5. Which of the following blood vessel bleeding conditions can be stopped 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

guess

There is a big peach in my chest, about the size of my fist.

Combine work and rest with clever arrangements, work hard and work hard to the end.

(Hit a human organ)

What do you learn about the heart from this riddle?

Heart position and size

Where is the exact location of the heart? What's the size?

Observation and thinking (8 minutes)

Look at the human heart model and think about the following questions:

1. How many chambers does the heart have? What blood vessels are they connected to?

2. Are the various chambers of the heart connected?

3. Are the thicknesses of each chamber of the heart the same? Why?

4. Where are the valves in the heart? What do they do?

What are the functions of arteries and veins?

Arteries Blood vessels that carry blood from the heart to various parts of the body.

Veins Blood vessels that carry blood from various parts of the body back to the heart.

main structures of heart

1. It has four cavities:

Left atrium, left ventricle, right atrium, right ventricle.

2. Heart wall characteristics:

The walls of the atria are thinner than the walls of the ventricles; the walls of the left ventricle are thicker than those of the right ventricle.

3. Valve:

atrioventricular valve, arterial valve

Let’s do it together

1. The "pump" that transports blood in the human body is ( )

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

2 . The heart valve can only open in one direction, ensuring that the blood flow direction is determined by ( )

A． Ventricles Atria Arteries B. ventricle atria veins

C. Atria Ventricles Arteries D. atria ventricles veins

3． Compared with the average person, the heart activity of long-distance runners is

A. The heart rate is relatively slow and the myocardial contractility is strong ( )

B． Fast heart rate and strong myocardial contractility

C. Slow heart rate, low cardiac output

D. Fast heart rate, high cardiac output

4． The number of pulses of a normal person should be equal to ( )

A. Cardiac output B. Blood pressure value

C. Respiratory rate D. Heart rate

5. Arterial blood refers to ( )

A. Blood that contains more oxygen, nutrients, and is bright red in color

B. Blood containing many nutrients and bright red color

C. Blood that contains a lot of carbon dioxide and is dark red in color

D. Blood with high oxygen content and bright red color

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Update Time: 2024-07-04

This template belongs to biology courseware People's Education Press seventh grade biology book volume 2 industry PPT template

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