S C I E N C E

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Modified In-School Off-School Approach Modules (MISOSA)

Distance Education for Elementary Schools

SELF-INSTRUCTIONAL MATERIALS

THE BLOOD VESSELS

Department of Education

BUREAU OF ELEMENTARY EDUCATION 2nd Floor Bonifacio Building DepEd Complex, Meralco Avenue Pasig City

Revised 2010 by the Learning Resource Management and Development System (LRMDS),

DepEd - Division of Negros Occidental under the Strengthening the Implementation of Basic Education

in Selected Provinces in the Visayas (STRIVE).

This edition has been revised with permission for online distribution through the Learning Resource Management Development System (LRMDS) Portal (http://lrmds.deped.gov.ph/) under Project STRIVE for BESRA, a project supported by AusAID.

Section 9 of Presidential Decree No. 49 provides: “No copyright shall subsist in any work of the Government of the Republic of the Philippines. However, prior approval of the government agency or office wherein the work is created shall be necessary for exploitation of such work for profit.” This material was originally produced by the Bureau of Elementary Education of the Department of Education, Republic of the Philippines.

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THE BLOOD VESSELS

Fill up the map with correct answer.

Are of 3 kinds is called

At the end of the lesson, you will be able to:

• Identify the types of the blood vessels • Describe the functions of each part

Blood

SOLID PARTS LIQUID PARTS

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Look at your wrist. Can you see a green line?

What other parts of your body can you see green lines? These lines are your blood vessels.

Activity 1. Roads in your Transport System

Your blood vessels are like roads where your bus, jeepneys and cars pass. It is through these blood vessels where blood flows.

1. Where do you pass when you go to school? Make a sketch of your route from home to school. Label the streets you pass by.

2. Where do buses, jeepneys and cars pass?

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Activity 2. Types of Blood Vessels There are 3 types of blood vessels, namely; arteries, capillaries and veins. Get to know more about these blood vessels by reading the descriptions and functions of each part.

Arteries are thick-walled and elastic They carry reddish blood with nutrients and oxygen away from the heart. The thick walls withstand the force of flow of blood as it flows from the heart. They are buried deep inside the body to keep them from injury. They branch off into even smaller Arteries that lead to capillaries.

Capillaries are the smallest blood vessels and can be seen only with the microscope. You find them near the skin. Oxygen and food in the blood pass through the capillary to the cells. Exchange of water, gases, nutrients and waste materials occurs between the blood and the tissues in the capillaries. Capillaries lead into another kind of blood vessels called veins.

Veins carry bluish blood with more carbon dioxide and other waste back to the heart out in to the lungs. The walls are thin and contain less muscle tissue than the arteries.

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Activity 3. What are the kinds of blood vessels? 1. Fill up the table below.

I LEARNED THAT:

The blood vessels are the passage ways of blood There are three kinds of blood vessels: arteries, veins and capillaries Arteries are the largest and carry blood with oxygen (oxygenated blood) away from the heart. Capillaries are very thin and have tiny openings in their walls. Veins carry blood (unoxygenated) back to the heart.

• What will happen if the blood vessels will not work? • Sometimes you prick your finger and no blood flows out. Explain why? • Sometimes a prick can cause blood to flow out. Explain why?

Kind of Blood Vessels Characteristics Functions 1.

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Complete the table. Use the words in the box.

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Artery Capillary Vein Carries blood with oxygen and nutrients away from the heart Carries blood with waste like carbon dioxide back to the heart The part where the exchange of gases, nutrients and wastes between the blood and body cells occur.