"Transportation of Substances in the Body" PPT (Second Lesson)

Description

"Transportation of Substances in the Body" PPT (Second Lesson)

Part One: Learning Objectives

1. Name the location of the heart and list its structure and functions;

2. Describe the structure and functional characteristics of arteries, veins, and capillaries.

Transportation of substances in the body PPT, part 2: step-by-step learning

1. The location, shape and size of the heart

Location: Located on the lower left side of the middle of the chest, between the two lungs.

Shape: shaped like a peach

Size: Like a human fist

2. Structure and function of the heart

Discussion and analysis

1. What tissue is the heart wall mainly composed of? What functions can be inferred from this?

The heart wall is mainly made of muscle.

Muscles have the function of contracting and relaxing, so the heart can promote the circulation of blood in the blood vessels.

Discussion: What is the difference between the atria and the ventricles in terms of heart wall thickness? What is the difference between the left ventricle and the right ventricle?

The ventricular wall is thicker than the atrium wall, and the left ventricular wall is thicker than the right ventricular wall

Discussion: What is the relationship between the four chambers of the heart?

There are atrioventricular valves between the atria and ventricles, the atria are connected to veins, and the ventricles are connected to arteries. There are arterial valves between the ventricles and arteries.

Observation: What special structures are there between the atria and ventricles, and between the ventricles and arteries?

There are atrioventricular valves between the atria and ventricles

There is an arterial valve between the ventricles and arteries

3. Structure and function of blood vessels

Arteries: blood vessels that carry blood from the heart to all parts of the body

Veins: Blood vessels that carry blood from all parts of the body back to the heart

Capillaries: blood vessels that connect the smallest arteries and veins

Characteristics of arteries

It is mostly found in _______ parts of the body.

The walls of arteries are ____ and elastic ____.

The speed of blood flow in the tube _____.

If you press your fingers on the inside of the radius in your wrist, you will feel a pulse. This is the pulsation of the radial artery.

PPT on the transportation of substances in the body, part 3: classroom exercises

1. When people with heart disease sit up suddenly, their heart beat may stop and lead to "death". At this time, the doctor will suddenly beat some part of the body to make the heart beat again. May I ask where the urgent pounding site should be ( )

A. The middle part of the chest is on the upper left side. B. The middle part of the chest is on the lower left side.

C. The middle part of the chest is on the upper right side. D. The middle part of the chest is on the lower right side.

2. When nurses give intravenous injections to patients, they often tie the upper arm tightly with a rubber tube. The veins at the distal end of the tied area will accumulate blood and swell and bulge. This shows that ()

A. Intravenous blood flows from the distal end to the proximal end

B. The distribution of veins is very shallow

C. The lumen of the vein is large and the wall is highly elastic.

D. There are no valves in the veins

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, transport of substances in the body PPT download, .PPT format;

For more information about the "Transport of Substances in the Body" PPT courseware, please click on the "Transport of Substances in the Body" ppt tab.

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Update Time: 2024-10-01

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

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