C. Number the sentences to show how blood flows through the heart. Blood goes through a valve to the bottom right chamber. Blood enters the top left chamber. The bottom right chamber pumps blood to the lungs. After traveling through the body, blood enters the top right chamber.

6. Cells produce energy from (a) muscles. (b) oxygen and food. (c) carbon dioxide.

A. Fill in the missing word. 1. The raw materials your body needs are called (cells, nutrients) 2. Both cheeses and meats contain . (carbohydrate, protein) 3. Sugar is a kind of 4. For energy, your body uses (bones, carbohydrates) 5. Proteins are found in milk and

6. Carbohydrates are either starches or \( \begin{array}{lll}\text { (a) salts } & \text { (b) sugars } & \text { (c) fats }\end{array} \)

3. Draw a relaxed and contracted sarcomere (see Textbook, p. 286, Fig, 11,6):

Answer True or False. 1. Two different foods can contain the same nutrient. 2. Nutrients are the part of food your body has to get rid of. 3. Your body needs proteins to grow and repair body tissue. 4. Fats do not supply energy to your body. 5. Nuts and oils have fats.