Name: Date: Class Period: The Circulatory System Lesson 2


Name: Date: Class Period:

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 1

________________________________ 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 is made of: • • • • A liquid called ___________________________________ Red blood cells, also called ___________________________________ White blood cells, also called ___________________________________ ___________________________________, also called thrombocytes 2

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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. 3

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. 4