Chapter 3Physical Activityand Fitness

Lesson 3Exploring theCirculatory System

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circulatory systemThe group of organs and tissues that act as transfer stations carrying needed materials to cells and removing their waste products

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

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

arteries

veins

pulmonarycirculation

When blood travels from the heart, through the lungs, and back to the heart

When oxygen-rich blood travels to all body tissues except the lungs

The force of blood pushing against the walls of the blood vessels

systemiccirculation

blood pressure

In this lesson, you will be able to

identify the functions of the circulatory system.

describe how blood circulates through the body.

recognize how to care for your circulatory system.

Predict

Look over the headings in this

lesson. Write a question you

think this lesson will answer.

After this lesson, look back to

see if your question was

answered.

Lesson HeadingsLesson Headings

• Your Heart and Blood Vessels

• The Process of Circulation

• What Makes Up Your Blood?

• Caring for Your Circulatory System

Your Heart and Blood Vessels

The circulatory system includes the heart, the blood vessels and the blood itself.

circulatory system The group of organs and tissues that act as transfer stations carrying needed materials to cells and removing their waste products

Your Heart and Blood Vessels

The heart pumps blood around the body through a network of arteries, veins, and capillaries.

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

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

capillaries Tiny blood vessels that carry blood to and from almost all body cells and connect arteries and veins

The Process of Circulation

The process of circulation involves pulmonary circulation and systemic circulation.

pulmonary circulation When blood travels from the heart, through the lungs, and back to the heart

systemic circulation When oxygen-rich blood travels to all body tissues except the lungs

Blood Pressure

A certain amount of blood pressure is needed to make blood circulate.

blood pressure The force of blood pushing against the walls of the blood vessels

Blood Pressure

A blood pressure reading measures two numbers.

The first is systolic pressure and the second is diastolic pressure.

What Makes Up Your Blood?

Blood is made up of plasma, red blood cells, white blood cells, and platelets.

plasma The yellowish, watery part of blood

Plasma makes up over half the volume of blood.

Blood Types

Red blood cells are one of four types: A, B, AB, or O.

Most people’s blood contains a substance called an Rh factor, a type of protein.

Blood Types and Compatibility

Type

O

Type

AType

B

Type

AB

Caring for Your Circulatory System

Tips for Caring for Your Circulatory SystemTips for Caring for Your Circulatory System

Make aerobic activity a habit.Make aerobic activity a habit.

Follow a balanced food plan that is low in fats.Follow a balanced food plan that is low in fats.

Develop strategies for managing stress.Develop strategies for managing stress.

Avoid using tobacco.Avoid using tobacco.

What I Learned

Identify What is the function of the circulatory system?

Lesson 3 Review

What I Learned

Vocabulary Define blood pressure.

Lesson 3 Review

What I Learned

Explain Why can’t certain blood types be combined?

Lesson 3 Review

What I Learned

Distinguish What is the difference betweenpulmonary and systemic circulation?

Lesson 3 Review

Thinking Critically

Infer Why do you think a blood pressure reading ispart of a typical medical checkup?

Lesson 3 Review

Thinking Critically

Apply In what ways do you think buildingcardiovascular endurance now will benefit youlater in life?

Lesson 3 Review

Chapter 3Physical Activityand Fitness

Lesson 3Exploring theCirculatory System

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