27. What Is The Primary Organ Of The Respiratory System? A. Heart B. Lungs C. Mouth D. Stomach, 28.

27. What is the primary organ of the respiratory system? A. heart B. lungs c. mouth D. stomach

28. Why is the heart important?
A. It stops the flow of blood. B. It checks the flow of blood. C. It occupies the chest cavity. D. It pumps the blood to move throughout the body.

29. Why is the blood important to the body?
A. It gives color to our skin. B. It carries oxygen and nutrients to different cells of the body c. It carries away carbon dioxide and other wastes from the body D. b and c

30. Why are platelets important to the body?
A. They give the blood its red color. B. They carry oxygen to all parts of the body. C. They surround the germs an weaken them. D. They make the blood clot to stop continues bleeding

31. What type of blood cell defends your body from infections?
A. plasma B. platelets C. red blood cells D. white blood cells

32. Why is nervous system important? A. It removes waste from the body. B. It absorbs the nutrients needed by the body. C. It protects our body from harmful external elements. D. It controls the other body systems so that they work properly.

33. What is nervous system?
A. The bodys control system B. The bodys breathing system C. The bodys food processing system D. The bodys blood-transporting system

34. What is the function of the spinal cord? A. They pump blood to the heart. B. They filter impurities from the blood. C. They carry blood to all parts of the body D. They carry messages to and from the brain.

35. Why is the spinal cord an important part of the nervous system? A. It receives messages from the brain and relay messages to the different parts of the body B. It controls the movement and the action of the human body. C. It gives us support of the body structure D. It protects the sense organ.

 

Answer:

27. B

28. D

29. B

30. D

31. D

32. D

33. A

34. D

35. B