"Heart and Blood Vessels" PPT

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"Heart and Blood Vessels" PPT

Part One: Heart

1. Heart

It is located on the left side of the chest and is about the same size as your fist.

Heartbeat is the contraction and relaxation of the heart

So, how does the heart work?

It can be seen that in every beat, the heart uses the contraction of the ventricles to push blood into the arteries, and at the same time uses the relaxation of the atria to draw blood back from the veins. Therefore, the heart is the pump of blood circulation.

The heart is always contracting and relaxing regularly. When contracting, the heart presses blood into the arteries; when relaxing, blood flows back to the heart from the veins. The heart continuously contracts and relaxes, thereby promoting the continuous flow of blood throughout the body. Every time the heart contracts and relaxes, we feel a heartbeat.

Heart and blood vessels PPT, part 2: blood vessels

2. Blood vessels - blood vessels

Comparison table of the structural and functional characteristics of three types of blood vessels

arteries

Thicker and more elastic

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

veins

Thin and less elastic

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

capillaries

Very thin, consisting of only one layer of epithelial cells

blood vessels connecting arterioles and venules

test you

1. You can often see “green veins” on the back of people’s hands, which belong to ( )

2. The blood vessels that often appear like jets when bleeding are ( )

3. Among the three types of blood vessels in the human body, the one that is conducive to material exchange is ( )

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

Heart and blood vessels PPT, part 3: blood circulation

3. Blood flows in the human body. What is the role of blood circulation?

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.

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.

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.

Heart and blood vessels PPT, Part 4: Protecting the heart and blood vessels

4. How to protect our heart and blood vessels?

1. Eat scientifically and eat less high-fat and high-cholesterol foods.

2. Participate in regular physical exercise.

3. Don’t smoke or drink alcohol.

Heart and blood vessels PPT, part 5: exercises

1. There are ____ chambers inside the heart, which are:

left atrium right atrium left ventricle right ventricle

2. The heart functions like a _____.

3. Arteries are blood vessels that carry blood from _____ to ________; veins are blood vessels that carry blood from ____ back to ______.

Keywords: Qingdao version fifth grade science PPT courseware free download, heart and blood vessels PPT download, .PPT format;

For more information about the "Heart and Blood Vessels" PPT courseware, please click the Heart and Blood Vessels ppt tab.

"Heart and Blood Vessels" PPT courseware:

The first part of the "Heart and Blood Vessels" PPT courseware content: Blood circulation The blood circulation system is a pipe system throughout the body composed of the heart and blood vessels. Blood can continuously flow in a certain direction in the blood circulation system, which is closely related to the structure and function of blood vessels and heart. There are relationships..

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Update Time: 2024-09-09

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

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