Answer True or False. 1. There are four chambers in the heart. 2. Valves in the heart let blood travel in all directions. 3. The right side of the heart sends blood to the lungs. 4. The blood that enters the top right chamber contains wastes from the cells.

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.

Draw a relaxed and contracted sarcomere (see Textbook, p. 286, Fig. 11.6)

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

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