"Human Blood Circulation" PPT

Description

"Human Blood Circulation" PPT

Part One: Introduction of New Course

The total length of blood vessels is about 96,000 kilometers, and the circumference of the earth is 40,000 kilometers.

learning target

1. Be able to distinguish between arteries, veins and capillaries, explain the functions of different types of blood vessels, and the structural characteristics suitable for the functions.

2. Be able to describe the structure and function of the heart, and explain the characteristics of the heart and its functions.

Human blood circulation PPT, part 2 content: blood vessels

Three types of blood vessels in the human body

vein capillary artery

What are the functions of the three types of blood vessels in the human body?

Arteries carry blood from the heart to various parts of the body

Veins carry blood from various parts of the body back to the heart

Capillaries connect arterioles and venules to exchange substances between blood and tissue cells

Observation and analysis

Observe arteries, veins and capillaries. What are the differences between them?

(1) Arteries

Features: Thick pipe wall and high elasticity

Fast blood flow in the tube

Transport blood from the heart to all parts of the body

(2) Veins

Features: Thin wall, low elasticity, large lumen

Blood flow in the tube is slow

Transport blood from all parts of the body back to the heart

There are venous valves in the veins of the limbs

(3) Capillaries

Exchange of substances between blood and tissue cells

Apply what you learn

1. What blood vessels are punctured when injecting a hanging bottle?

Veins on the arm - veins

①The tube wall is thin and easy to puncture

②The distribution is shallow and easy to identify.

③ Blood flow is slow, avoid improper acupuncture and excessive bleeding.

2. Based on the bleeding situation, determine which blood vessels are damaged?

Human body's blood circulation PPT, the third part: heart

structure of heart

(1) Heart wall

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

The heart wall is mainly composed of _____ tissue. Muscle tissue has the functions of contraction and relaxation. Therefore, the heart can promote blood circulation in blood vessels and is the power organ for blood transportation.

(2) Four cavities

Analysis and 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 walls are thicker than the atrium walls.

The left ventricle has thicker walls than the right ventricle.

(3) Valve:

Apply what you learn

1. Inject water from the pulmonary vein. Where does the water flow out?

2. Where does the water from the aorta flow out?

Human blood circulation PPT, part 4 content: heart rate and pulse

The number of times the heart beats per minute is called _____, and the average heart rate of an adult at rest is _________. Children's heart rates are generally higher than those of adults.

When the heart contracts, the walls of the arteries first expand outward and then contract. The arteries pulsate with the contraction and relaxation of the heart, known as the arterial pulse.

Explore: The impact of exercise on heart rate

Discussion: Why is the human heart rate faster during exercise than during calmness?

When the human body is in motion, the contraction and relaxation of skeletal muscles are strengthened, and the energy consumed increases. More oxygen is needed to decompose organic matter in tissue cells in order to release energy. At the same time, waste products such as carbon dioxide also need to be transported away in time. In order to adapt to With this change, during exercise, a person's heartbeat speeds up, blood circulation also speeds up, and the ability to transport oxygen, nutrients, and waste products such as carbon dioxide increases.

The number of pulses per minute is the same as the number of heartbeats. Disease in a certain organ of the human body often manifests itself in the pulse. It is based on this principle that traditional Chinese medicine developed the method of "pulse checking" to diagnose diseases. Do you know who invented "pulse cutting"?

Human blood circulation PPT, part 5: feedback in class

1. The blood vessel connected to the left atrium is ( )

A. Aorta B. Pulmonary artery C. Pulmonary vein D. Vena cava

2.The thickest myocardial wall is ( )

A. Left ventricle B. Right ventricle C. Left atrium D. Right atrium

3. The function of the heart valve is to ensure the direction of blood flow from ( )

A. Atrium → Ventricle → Artery B. Atrium → Ventricle → Vein

C. Ventricle → Atrium → Artery D. Vein → Ventricle → Atrium

4.Have you ever explored the relationship between heart rate and exercise? When you enter a resting state from exercise, the change in heart rate is ( )

A. From slow to fast B. No change

C. From fast to slow D. Difficult to determine

Keywords: Jiangsu Education Edition seventh grade biology PPT courseware free download, human blood circulation PPT download, .PPT format;

For more information about the PPT courseware "Blood Circulation of the Human Body", please click on the "Blood Circulation of the Human Body" PPT tab.

"Human Blood Circulation" PPT courseware:

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Update Time: 2024-09-08

This template belongs to biology courseware Jiangsu Education Edition Seventh Grade Biology Volume 2 industry PPT template

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