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The Circulatory System
Lesson 2: Standard 9a. Students know how the complementary activity of major body systems provides cells with oxygen and nutrients and removes toxic waste products such as carbon dioxide.
What have we learned so far?
• The definitions of specialized cells, tissues, organs, and organ systems
• The body is kept in homeostasis (balance) by the actions of different organ systems working together
• Feedback inhibition is the mechanism for maintaining homeostasis in the body
Parts of the Circulatory System
The human circulatory system consists of
• the ________________________
• the ________________________
• blood ______________________
 _______________________________


_______________________________
_______________________________
Blood Vessels
• ________________________________ carry oxygen-rich blood away from the heart and to the body have thicker walls to withstand higher blood pressure
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• ________________________________ carry oxygen-poor blood to the heart have valves to prevent blood from flowing back in the wrong direction
 _______________________________ are the smallest blood vessels so narrow that blood cells pass through in a single file deliver oxygen and nutrients to all cells of the body
Blood
Blood is made of:
• A liquid called ___________________________________
• Red blood cells, also called ___________________________________
• White blood cells, also called ___________________________________
• ___________________________________, also called thrombocytes
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Blood Cells
• Red blood cells have no _______________________.
They contain a protein called
_______________________________ that carries _______ to cells and __________ away from cells.
• White blood cells help the body fight off
____________________. There are many different types of white blood cells
• Platelets are cell _________________ that help with blood _______________
The Heart
Label the chambers, valves, veins, and arteries.
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Blood Flow Through the Heart
Draw arrows to trace the flow of blood through the heart.
Blood Circulation Through the Body
• The right side of the heart pumps blood from the heart to the lungs. This is called _____________________________ circulation.
• In the lungs, CO
2
in the blood is
____________________________ for O
2
• Oxygen-rich blood flows from the lungs, into the left side of the heart, and to the rest of the body. This is called ____________________________ circulation.
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