4.1 The body's transport system

The Body’s Transport System

​Chapter 4 Lesson 1

​Objectives

Explain the functions of the cardiovascular

system.

Describe the function and structure of the heart.

Sequence the path blood follows through the

cardiovascular system.

Open Ended

Read "my planet diary" and answer the following questions:

1. Why is it important for a person’s heart

to be healthy?

2. About how many times does your heart

beat in a week? In a year?

• The cardiovascular system

  delivers blood to all parts of the body, carrying necessary substances to cells and carrying waste materials away from cells.

• Blood contains cells that fight disease, as well.

What Is the Role of the Heart?

Without your heart your blood would not go anywhere. The heart is a hollow, muscular organ. The heart pumps blood to the body through blood vessels.

The Heart’s Structure

The heart has a right side and left

side that are completely separated by a wall of tissue called the septum. Each side has two chambers. Each upper chamber, called an atrium (AY tree um; plural atria), receives blood that comes into the heart. Each lower chamber, called a ventricle, pumps blood out of the heart. The pacemaker, a group of cells in the right atrium, sends out signals that make the heart muscle contract. The signals regulate heart rate.

​

Match

Match the following

• STEP 1 AND 2

• STEP 3

• STEP 4

• STEP 5

• STEP 6

The heart relaxes and atria fill with blood. The atria contract.

The blood moves into ventricles

The ventricles contract

The valves between atria and ventricles shut;blood goes into vessels

the valves between the ventricles and vessels shut

• The heart relaxes and atria fill with blood. The atria contract.

• The blood moves into ventricles

• The ventricles contract

• The valves between atria and ventricles shut;blood goes into vessels

• the valves between the ventricles and vessels shut

Labeling

In each

box, write where the blood

from the heart travels to.

LOOP 1 AND LOOP 2

Drag labels to their correct position on the image

TO BODY

TO LUNGS

Open Ended