1. Introduction to the Heart

2. The heart is a cone-shaped muscular organ located within the __________. Its apex rests on the ____________. Its base is at the level of the _________ rib. The coronary arteries that nourish the myocardium arise from the _____________. The ____________ are receiving chambers; the _________ are discharging chambers. The muscular walls of the heart is called the _____________. The myocardium of the ______ ventricle is much thicker than that of the _______ ventricle. The membrane that lines the heart and forms the valve flaps is called the _______________.

3. Introduction to the Heart The outermost layer of the heart is the ______________. The covering surrounding the heart is called the _____________. The space between the ____________ and ___________ is called the pericardial ______. The pericardial sac contains a small amount of fluid to help reduce ____________ when the heart contracts.

4. 1._________________________ 2._________________________ 3._________________________ 4._________________________ 5._________________________ 6._________________________ 7._________________________ 8._________________________ 9._________________________ 10._________________________ 11._________________________ 12._________________________ 13._________________________ 14._________________________ 15._________________________ Anatomy of the Heart

5. A.Blood enters heart from the head and upper extremities via the _____________________. B.Blood enters heart from the lower extremities via the ________________________. C.Into the __________________ D.Across the ________________ E.Into the __________________ F.Across the ________________ G.Into the __________________ H.On its way to the ___________ I.Blood returns to the heart via the ______________________, now fully loaded with oxygen. J.Into the __________________ K.Across the ________________ L.Into the __________________ M.Across the __________________ N.Into the __________________ O.From here, blood is distributed through the body through ___________ and ___________. P.Blood returns to vena cava by way of _______________. Flow of Blood Through the Heart

7. 1._________________________ 2._________________________ 3._________________________ 4._________________________ 5._________________________ 6._________________________ 7._________________________ 8._________________________ 9._________________________ 10._________________________ 11._________________________ 12._________________________ 13._________________________ 14._________________________ 15._________________________

8. A Microscopic Look at Heart Muscle

9. Listening to Heart Sounds

10. The Conduction System: The Nerves of the Heart

11. How to Read an ECG

12. A recording of the electrical activity of the heart is called an _____________. The period when the atria are depolarizing (getting ready to contract) is called the ___________. The period when the ventricles are depolarizing (getting ready to contract) is called the ____________. The period when the ventricles are repolarizing is called the ____________.

13. How to Read an ECG An abnormally slow heartbeat (slower than 60 beats per minute in a non-athlete) is called ______________. An abnormally rapid heartbeat (faster than 100 beats permit at rest) is called _______________. A condition in which the heart is uncoordinated and useless as a pump is called ______________. Transient chest pain, resulting from ischemia of the myocardium, is called______________.

14. Atrial Fibrillation

15. Ventricular Fibrillation

16. Fetal Circulation Identify:  Umbilical cord  Umbilical arteries  Umbilical vein  Foramen ovale  Ductus arteriosus

17. Anatomy of Blood Vessels

18. Tunica intima Tunica media Tunica externa o Single layer of endothelium o Bulky middle coat, containing smooth muscle and elastin o Provides a smooth surface to decrease resistance to blood flow o The only tunic of capillaries o Also called the adventitia o The only tunic that plays an active role in blood pressure regulation o Supporting, protective coat