"Heart and Blood Vessels" PPT Courseware

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"Heart and Blood Vessels" PPT Courseware

Part One: Blood Circulation

The blood circulation system is a system of pipes throughout the body consisting of the heart and blood vessels

Blood can continuously flow in a certain direction in the blood circulation system, which is related to the structure and function of blood vessels and heart.

There are three types of blood vessels: arteries, veins and capillaries. A blood vessel is named based on the direction in which it carries blood.

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. There are venous valves inside to prevent blood from flowing back

Think about it:

Is there any difference between the two concepts of arteries and veins and arterial blood and venous blood? Does arterial blood always flow in arteries, and venous blood always flows in veins?

Heart and blood vessels PPT, part 2: heart

heart position

It is located in the middle of the chest, on the lower left side, between the two lungs.

Feeling: Put your hand on your chest to feel your heartbeat and accurately tell the position of your heart.

Heart and blood vessels PPT, Part 3: Structure of the heart

1. Heart wall

Mainly composed of myocardium, the ventricular wall is thicker than the atrium wall, and the left ventricular wall is thicker than the right ventricular wall.

Two or four chambers

left atrium, right atrium, left ventricle, right ventricle

The left atrium communicates with the left ventricle, and the right atrium communicates with the right ventricle. The left atrium communicates with the pulmonary veins, the right atrium communicates with the superior and inferior vena cava, the left ventricle communicates with the aorta, and the right ventricle communicates with the pulmonary artery

It can be seen that the ventricles are connected to the arteries and the atria to the veins.

3. Valve

There are atrioventricular valves between the atria and ventricles that can only open toward the ventricles. There is an arterial valve between the ventricle and the artery, which can only open toward the artery.

This ensures that blood can flow in a certain direction: blood can only flow from the atria to the ventricles, and from the ventricles to the arteries, but not backwards.

Heart and blood vessels PPT, Part 4: Heart rate

data card

The heart is always contracting and relaxing regularly. When it contracts, it pushes blood into the arteries; when it relaxes, it lets the blood flow back from the veins and blood vessels to the heart, pushing the blood throughout the body to flow continuously. Every time the heart contracts and relaxes, we Say your heart beats once.

The blood transports nutrients absorbed by the intestines and oxygen absorbed by the lungs to all parts of the body. It also transports waste products such as carbon dioxide produced throughout the body to the respiratory and excretory organs for elimination from the body.

Heart rate: The number of times the heart beats per unit time is called heart rate

Heart rate varies with age, gender and health. The average adult heart rate is 75 beats per minute, and the normal range is generally 60 to 100 beats per minute. A heart rate below 60 beats per minute is called bradycardia (except for athletes), and a heart rate above 100 beats per minute is called tachycardia.

Heart and blood vessels PPT, Part 5: Test our heartbeat

When people are emotionally excited, engaged in physical labor or sports, their heartbeat speeds up significantly. Disease in a certain organ of the human body often causes changes in the speed, strength, and strength of the heartbeat. People of different ages have different heartbeats. Under normal circumstances, children's heartbeats range from 60 to 100 times per minute.

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"Heart and Blood Vessels" PPT:

"Heart and Blood Vessels" PPT Part One: Heart 1. The heart is located on the left side of the chest, about the same size as your fist. The heartbeat is the contraction and relaxation of the heart. So, how does the heart work? It can be seen that in every beat of the heart...

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Update Time: 2024-11-18

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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