1. Which of the following is not a function of the circulatory system?

breaks down large molecules
delivers oxygen to body cells ****
takes carbon dioxide away from body cells
fights infection

2. Which of the following explains why the heart is organized so that it pumps
blood to two different locations?

to supply blood to two different sides of the body
to allow a way for the blood to pick up new blood cells
to move oxygen-poor blood through the lungs and to move oxygen-rich blood
to the rest of the body
to provide a way for blood to pick up nutrients at one location and oxygen at another ****

3. Which set of terms below would be the best choice to use to describe
the components of blood?

leukocytes, ventricle, atrium, aorta
platelets, plasma, erythrocytes, leukocytes ****
electrolytes, artery, vein, cardiac
antibodies, hemoglobin, pulmonary, systemic

#1 is not correct.

Breaking down large molecules into smaller ones helps the body absorb nutrients from different kinds of food.

#2 The circulatory system has the main function of collecting carbon dioxide excreted by cells in different parts of the body and exchange for oxygen in the lungs.

#3 is correct. All items listed are constituents of blood.

To answer these questions, we need to understand the functions of the circulatory system, the organization of the heart, and the components of blood.

1. The function of the circulatory system is to transport substances, such as oxygen, nutrients, hormones, and waste products, throughout the body. It does not break down large molecules. Therefore, the correct answer is "delivers oxygen to body cells."

2. The organization of the heart enables it to pump blood to different locations. The heart is divided into four chambers - two atria and two ventricles. The right side of the heart pumps oxygen-poor blood to the lungs to pick up oxygen, while the left side pumps oxygen-rich blood to the rest of the body. This setup ensures proper circulation and oxygenation of blood in the body. Therefore, the correct answer is "to provide a way for blood to pick up nutrients at one location and oxygen at another."

3. Blood consists of various components. The best choice to describe these components is: platelets, plasma, erythrocytes, leukocytes. Platelets are cell fragments that aid in blood clotting, while plasma is the liquid portion of blood that carries nutrients, hormones, and proteins. Erythrocytes, also known as red blood cells, transport oxygen using the protein hemoglobin. Leukocytes, or white blood cells, are involved in the immune response and fighting infections. Therefore, the correct answer is "platelets, plasma, erythrocytes, leukocytes."

By understanding the functions, organization, and components of the circulatory system, you can determine the correct answers to these questions.