cardio MCAT2 - 49 Circulatory Systems TEST FILE QUESTIONS...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
49 Circulatory Systems TEST FILE QUESTIONS Fill in the Blank 1. From fishes to amphibians to reptiles to mammals and birds, the complexity and number of chambers in the heart increases. An important consequence of this increased complexity is the gradual separation of the circulatory system into two independent circuits—_______ and _______. Answer: pulmonary; systemic 2. The “lub-dub” sounds of the cardiac cycle are caused by the _______. Answer: shutting of the heart valves 3. A blood clot that becomes established within the lumen of an artery is termed a thrombus. A piece of a thrombus breaking loose can travel through the arteries and eventually become lodged in a vessel of small diameter. If this occurs in the brain, the resulting condition is called a _______. Answer: stroke 4. The interstitial fluid that accumulates outside the capillaries is returned to the heart by a separate system of vessels called the _______ system. Answer: lymphatic 5. In a human being under normal conditions, the bone marrow can produce about 2 million _______ every second. Answer: red blood cells (or erythrocytes) 6. In open circulatory systems of arthropods, fluid enters the _______ through holes called ostia. Answer: heart 7. In humans, blood is pumped from heart to lungs and back through the _______ circuit. Answer: pulmonary 8. The walls of large _______ have elastic fibers and can withstand high pressures. Answer: arteries 9. The condition of _______ results from accumulation of interstitial fluids and tissue swelling. Answer: edema
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
10. The primary pacemaker of the heart is the _______ at the junction of the superior vena cava and right atrium. Answer: sinoatrial node 11. Blood cells form from _______ in the bone marrow. Answer: stem cells 12. _______ are cell fragments responsible for blood clotting. Answer: Platelets 13. The brain’s cardiovascular control center is in the _______. Answer: medulla 14. The _______ slows the heart when the individual is plunged into cold water. Answer: diving reflex 15. _______ are vessels that carry blood away from the heart, and _______ are vessels that carry blood back to the heart. Answer: Arteries; veins 16. The lymphatic system empties intercellular fluid into the _______, which empty into large veins at the base of the neck. Answer: thoracic ducts 17. In humans, contraction of the right ventricle pumps blood into the _______. Answer: pulmonary artery 18. Snakes, lizards, and turtles can bypass the lung circuit and pump all blood around the body because of the incomplete division of their _______. Answer: ventricles Multiple Choice 1. A cardiovascular system is not necessary in the hydra because it a. is an aquatic animal. b. has no skeleton. c. is only two cells thick. d. has tentacles to move water. e. does not move rapidly. Answer: c
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern