“The Heart: Our Circulatory System”
This science article tells us how our heart and circulatory system work together to keep us alive and healthy. It describes the heart as a powerful pump that pushes blood to every part of the body though tubes called blood vessels. It explains what blood is made of and what these different elements do. It traces the 6,000- mile journey that blood takes from the heart to every cell in the body, back to the heart, out to the lungs, and back again to the heart.
Key Words
arteries: blood vessels that carry blood from the heart to the rest of the body
blood vessels: tubes through which blood flows in your body
capillaries: very small, narrow blood vessels
circulatory: relating to the circulation of blood through the body
pulmonary: relating to the lungs
veins: blood vessels that carry blood to your heart
Academic Words
constantly = always or regularly
➡ The human body is constantly working— twenty-four hours a day!
contract = become smaller or tighter
➡ A lack of oxygen to the brain caused the man’s arteries to contract, cutting off the blood supply.
network = a system of lines or tubes that cross each other and are connected to each other
➡ The human body is made up of a network of systems that all work together.
regulate = adjust things within a system to keep the system operating well
➡ Our brains regulate the systems in our bodies. Without the brain, the body would not function.
transport = move or carry from one place to another
➡ His circulatory system was weak and could no longer transport blood to his limbs.
Word Study: Related Words
Related words are words that belong to the same word family. They share the same root and have related
meanings.
cir • cu • late (verb) to move around within a system, or to make something do this
cir • cu • la • tion (noun) the movement of blood around your body
cir • cu • la • tory (adjective) relating to the movement of blood through the body
Highlighted Words
immune system, system that protects the body against illnesses
elastic, able to stretch and return to its original shape
Imperatives
Use an imperative to give directions, orders, advice, or warnings.
The implied subject of an imperative statement is always you. In imperatives, do not say or write you.
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