Heart Study Guide True/False Indicate whether the statement is true or false. 1.

Question

Heart Study Guide True/False Indicate whether the statement is true or false. 1. The internal layer of the tissue in the heart is the epicardium. 2. The heart of the developing human embryo begins to beat regularly early in the fourth week after fertilization. 3. A major function of the pericardial sac is protection against friction. 4. The mitral valve has three flaps. 5. The tunica media is also called the tunica adventitia 6. Anastomoses are important for providing collateral circulation. 7. The value of an anastomosis is that it allows blood to bypass a blood vessel obstruction. 8. Arteries always carry blood away from the heart. 9. The tunica intima of arteries provides a smooth lining with valves to ensure one-way flow. 10. Veins always carry deoxygenated blood 11. As the external iliac artery enters the thigh, its name changes to the femoral artery 12. Precapillary sphincters increase the flow of blood through a tissue when they relax. 13. Precapillary sphincters are located in venules. 14. Pulmonary circulation is blood flow through the liver 15. Systemic circulation includes blood flow to all parts of the body except the lungs. 16. The pulmonary artery carries oxygenated blood. 17. The cirele of Willis is an example of an anastomosis. 18. The ductus arteriosus allows fetal blood to bypass the nonfunctioning fetal liver. 19. Umbilical arteries carry blood from the placenta to the fetus.

Explanation / Answer

1. FALSE ( THE INNERMOST LAYER OF THE HEART IS ENDOCARDIUM )

2. TRUE ( THE HEART STARTS TO BEAT AT 105 - 121 TIMES PER MINUTE IN THE 4TH WEEK AFTER FERTILIZATION

3. TRUE ( FUNCTIONS OF PERICADIAL SAC INCLUDES PRTECTION FROM FRICTION & INFECTION .

4. FALSE ( MITRAL WALL ALSO KNOWN AS BICUSPID WALL HAS 2 SACS IT IS PRESENT IN THE

LEFT SIDE OF THE HEART BETWEEN THE ATRIA AND VENTRICLE .)

5. FALSE ( TUNICA EXTERNA IS CALLED IS TUNICA ADVENTITIA WHICH IS THE OUTERMOST LAYER OF BLOOD VESSEL WHICH SURROUND THE TUNICA MEDIA THAT IS THE MIDDLE LAYER.

6. TRUE ( ANASTOMOSES IS THE COMMUNICATION BETWEEN NEIGHBOURING BLOOD VESSEL THAT PROVIDES COLLATERAL CIRCULATION WHEN ONE OF THE ARTERIES GET BLOCKED.

7. TRUE ( ONE OF MOST IMPORTANT FUNCTION OF ANASTOMOSES IS THAT IT ALLOWS THE BYPASS OF THE BLOOD WHEN THE ARTERY GETS BLOCKED WITH THE HELP OF THE NEIGHBOURING ARTERIES.

8. TRUE ( ARTERIES ALWAYS CARRY BLOOD AWAY FROM THE HEART WHETHER IS OXYGENATED OR DEOXYGENATED IN CASE OF PULMONARY ARTERY. )

9. FALSE ( TUNICA INTIMA IS THE INNERMOST LAYER OF THE ARTERY HOWEVER IT DOESNOT CONTAIN ANY VALVE THEY ARE ONLY PRESENT IN THE VEINS )

10. FALSE ( THERE IS ONE EXCEPTIION TO THIS THAT IS THE PULMONARY VEIN THAT CARRIES THE OXYGENATED BLOOD FROM THE LUNGS TO THE HEART . )

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