The Circulatory System

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The Circulatory System is made up of the ____          ______ , blood, and blood vessels. There are over ____          ______ kilometres of blood vessels in our body. Blood vessels are elastic, tube-like veins, arteries and capillaries.

The circulatory system has the job of moving ____          ______ through the entire body. Blood is made up of ____        ____ , white cells, red cells, and ____           ____ . White cells fight ___      __ ___ , red cells carry ____     _____ , and platelets cause the blood to clot. Blood is the main method the body has for moving oxygen, nutrients/food, heat, and hormones needed for energy and growth to our tissues and organs. It also acts to help remove ____          ______ .

Your heart is the size of a ____          _ and is found ____                             _____                    ______________                      __________. Your heart is a strong hollow muscle that can be compared to two ____          ______. The left side pumps ____          ______ rich blood into your arteries. Arteries branch out into smaller and smaller blood vessels. The smallest are called capillaries which are ____          ____ mm across. In the capillaries, the blood releases oxygen and nutrients to the cells which turn them into energy. The “used” blood brings waste products back to the ____          _____ side of the heart. Then it is sent to your lungs for fresh ____            ___ and flows to the left side to start all over again. All this takes ____          ______ seconds.

“Blue blood” is blood that is low in ___         _          ______. The artery that carries blue blood to your lungs is called the ____          ___                                    ___. The veins carrying red blood from the lungs to the heart are the ____          ____                          __.

Red blood carries ____          ______. The largest artery in the body is called the ____          ______, and it is ____          ______ cm across. The largest vein is the _______ __          ___                                            ___. 

____          _____    _ in the heart keep the blood moving in the right direction. Blood is cleaned in the two ____        ______ which are located ____            ____          __.

During your lifetime, your heart beats ____          ___         ___ times.
The human body contains ____          ______ litres of blood.
An adult heart pumps ____          ______ litres of blood a day.
A baby’s heart beats  ____          ______ /minute.
A child’s heart beats  ____          ______ /minute.
An adult’s heart beats ____          ______ /minute.