1) What are the two main parts of the circulatory system? a) The respiratory system and the digestive system b) The cardiovascular system and the lymphatic system c) The skeletal system and the muscular system d) The nervous system and the endocrine system 2) What is the main function of the heart? a) To digest nutrients b) To store oxygen c) To pump blood throughout the body  d) To remove waste products from the body 3) What is the main function of the cardiovascular system? a) To control body temperature b) To pump blood throughout the body  c) To help the body digest food d) To protect the body from infection 4) What happens to blood when it travels to the body’s cells? a) A. It picks up oxygen and nutrients b) B. It delivers oxygen and nutrients, and picks up waste products c) C. It becomes oxygenated d) D. It changes into red blood cells 5) What is meant by a “double loop system”? a) A. Blood only flows through the heart once b) B. The heart beats twice for every breath c) C. Blood travels in two loops: one between the heart and lungs, and one between the heart and body  d) D. The blood moves in a figure-eight pattern 6) What is the role of red blood cells? a) A. To produce energy for the body b) B. To carry oxygen to the body and remove carbon dioxide c) C. To fight off infections d) D. To pump blood through the body 7) Which chamber of the heart does blood enter after returning from the body? a) Left atrium b) Left ventricle c) Right atrium  d) Right ventricle 8) What is the main function of the circulatory system? a) To help the body move and exercise b) To move nutrients and oxygen to all body cells c) To digest and absorb food d) To control body temperature 9) What connects the heart to the rest of the body? a) The nervous system b) The respiratory system c) A system of blood vessels d) The skeletal system 10) What is the function of an artery? a) To carry blood away from the heart b) To carry blood to the heart c) To exchange gases with cells d) To store oxygen 11) How does a vein differ from an artery? a) A vein carries blood away from the heart. b) A vein has thicker walls than an artery. c) A vein carries blood back to the heart and has thinner walls. d) A vein connects arteries and capillaries. 12) What happens in the capillaries? a) Blood is pumped by the heart. b) B. Substances are exchanged between the blood and body cells. c) Blood is stored before it moves to the veins. d) Oxygen is added to the blood in the lungs. 13) What is the pulmonary artery’s job? a) To carry oxygen-rich blood from the lungs to the body b) To carry oxygen-poor blood from the heart to the lungs c) To carry blood from the lungs to the heart d) To connect arteries and veins 14) What kind of circulatory system does the human body have? a) Single loop system b) Double loop system c) Open circulatory system d) Simple loop system 15) What is the main function of the lymphatic system? a) A) To carry oxygen to all parts of the body b) B) To return fluid from tissues back to the bloodstream c) C) To pump blood throughout the body d) D) To produce red blood cells 16) What do lymph nodes do? a) A) Produce red blood cells b) B) Filter lymph and trap bacteria c) C) Pump blood through the body d) D) Store glucose for energy 17) Which of the following is part of lymph? a) A) Red blood cells b) B) Platelets only c) C) Water, white blood cells, and dissolved materials d) D) Only plasma 18) What is the main function of the respiratory system? a) A. To pump blood throughout the body b) B. To digest food and absorb nutrients c) C. To bring oxygen into the body and remove carbon dioxide and water d) D. To control body temperature 19) Which of the following is not part of the respiratory system? a) A. Nose b) B. Trachea c) C. Stomach d) D. Lungs 20) What is the role of the alveoli in the lungs? a) A. To filter dust from the air b) B. To direct air into the trachea c) C. To store oxygen temporarily d) D. To allow gases to move between air and blood 21) How are respiration and breathing related? a) A. They are the same process. b) B. Breathing provides the oxygen needed for cellular respiration. c) C. Respiration happens only in the lungs. d) D. Breathing is another name for cellular respiration. 22) What happens to your chest when you inhale? a) A. It moves downward and inward. b) B. It moves upward and outward. c) C. It remains still. d) D. It collapses. 23) During inhalation, what causes air to move into the lungs? a) A. Increased air pressure inside the lungs b) B. Decreased air pressure inside the lungs c) C. Movement of the diaphragm upward d) D. Relaxation of rib muscles 24) What happens when you exhale? a) A. The diaphragm and rib muscles contract. b) B. The pressure inside the lungs decreases. c) C. The chest expands. d) D. The chest lowers and air is forced out. 25) Where does the exchange of oxygen and carbon dioxide occur? a) A. In the trachea b) B. In the alveoli and capillaries c) C. In the bronchi d) D. In the diaphragm 26) Why is the exchange of gases important for the body? a) A. It removes oxygen from the blood. b) B. It keeps the concentrations of gases in the blood balanced. c) C. It increases water levels in the body. d) D. It strengthens the diaphragm muscles. 27) What is the process of removing wastes from the body called? a) A. Ingestion b) B. Digestion c) C. Excretion d) D. Respiration 28) Which system of the body is responsible for removing waste products? a) A. Respiratory system b) B. Excretory system c) C. Circulatory system d) D. Nervous system 29) Why must the body remove waste products? a) A. To increase body temperature b) B. To maintain homeostasis c) C. To help blood clot d) D. To produce energy 30) Which waste product is produced by cells during their activities? a) A. Oxygen b) B. Carbon dioxide c) C. Glucose d) D. Protein

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