1. If a person has just eaten a meal rich in proteins and carbohydrates, which molecules would the circulatory system be actively transporting from the digestive system to the body's cells?
- A. Oxygen and carbon dioxide
- B. Amino acids and glucose
- C. Only water and vitamins
- D. Fats and fiber
2. The circulatory system is a "transportation highway." In this analogy, what would substances like glucose and oxygen represent?
- A. The roads
- B. The fuel for the trucks
- C. The delivery trucks
- D. The cargo or goods
3. Which of the following would be a direct consequence if a group of cells were deprived of their blood supply?
- A. The cells would start to produce their own glucose.
- B. The cells would be unable to receive oxygen for cellular respiration.
- C. The cells would immediately signal the digestive system to work harder.
- D. The cells would rely on the nervous system for nutrients.
4. What is the primary function of the circulatory system in relation to other body systems like the digestive and respiratory systems?
- A. To produce the energy needed for digestion and respiration
- B. To break down large food molecules into smaller ones like glucose
- C. To distribute substances like oxygen and nutrients to all body cells
- D. To exchange gases directly with the outside environment
5. A blockage in a major blood vessel would most directly interfere with which process?
- A. The initial digestion of food in the stomach.
- B. The exchange of gases in the lungs.
- C. The delivery of oxygen and glucose to tissues.
- D. The production of amino acids from proteins.
6. What is the primary reason that large food molecules like starch and protein must be broken down during digestion?
- A. Because they are toxic to the body in their original form.
- B. Because they are too large to be absorbed by and enter the body's cells.
- C. Because they do not contain any usable energy until they are made smaller.
- D. Because they must be converted into water to keep the body hydrated.
7. When a person eats a meal rich in protein, such as chicken or beans, the digestive system breaks these proteins down into which smaller building blocks?
- A. Glucose
- B. Starch molecules
- C. Fatty acids
- D. Amino acids
8. A student eats a potato, which is primarily composed of starch. What is the main small molecule that will be produced from the digestion of this starch and then used by the body's cells for energy?
- A. Amino acid
- B. Glucose
- C. Protein
- D. Cellulose
9. What is the ultimate fate of small molecules like glucose and amino acids after they are produced by the digestive system?
- A. They are immediately expelled from the body as waste.
- B. They are stored in the stomach for future digestion.
- C. They are absorbed by cells to be used for energy and repair.
- D. They are reassembled into starch and protein in the intestines.
10. Which of the following statements best describes the overall function of the digestive system?
- A. It circulates nutrients to all parts of the body.
- B. It converts large, unusable food molecules into small, absorbable nutrients.
- C. It stores food for long-term energy needs without changing its form.
- D. It filters waste products directly from the blood.