Question

23-29

23. has an open circulatory system. A. Frog B. Chicken C. Fly D. Human 24. Which statement is wrong in regards to the comparison between the closed and open circulatory system? A. Closed circulatory system is more energy-consuming. B. Closed circulatory system has blood pressure C. Closed circulatory system can regulate the blood flow to certain organ. D. Closed circulatory system can quickly dissipate body heat. 25. The heart chamber that receives blood is called A. Ventricle B. Atrium C. Septum D. Sinoatrial node 26. Which statement is correct in regards to the blood vessels? A. B. C. D. Veins always carry the deoxynated blood. Arteries always carry deoxynated blood. Veins carry blood away from the heart. Arteries carry blood away from the heart. 27. contributes to the systolic heart sound. A. Open of mitral valve B. Closure of mitral valve C. Open of aortic valve D. Closure of aortic valve 8. pumps blood to the systemic circuit. A. Right atrium B. Left atrium C. Right ventricle D. Left ventricle 29. The pacemaker of heart is located at A. Right atrium B. Left atrium C. Right ventricle D. Left ventricle Page 4 of 10

Answer 1

23. Answer is C. Fly

Fly has an open circulatory system. Frog, chicken and human have closed circulatory system.

24. False statement is D. Closed circulatory system can quickly dissipate body heat.

Because the open circulatory system gives animals greater control over their body temperature, which can be a distinct advantage at times. For example, it can help to quickly dissipate heat, allowing insects to survive in extremely hot environments.

25. Answer is B. Atrium

The heart has four chambers: two atria and two ventricles. The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle. The right ventricle pumps the oxygen-poor blood to the lungs. The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle.

26. Correct statement is D. Arteries carry blood away from the heart.

Veins are blood vessels that carry blood toward the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.

Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well).

27. Answer is B. Closure of mitral valve contributes to the systolic heart sound.

The "lub" is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole.

28. Answer is D. Left ventricle.

29. Answer is A. Right atrium

Electrical impulses from your heart muscle (the myocardium) cause your heart to contract. This electrical signal begins in the sinoatrial (SA) node, located at the top of the right atrium.