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Make USS Code 128 in VS .NET PART 4 Anatomy and Physiology of Animals

PART 4 Anatomy and Physiology of Animals
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rounded, like a knot The word sinoatrial indicates its anatomical location The S-A node lies in the outer wall of the right atrium, just below the entrance of the superior vena cava a major venous (VEE-nus) sinus (SIGHnus) (A sinus, in general, is a large vein that is shaped like a hollow bay [sin], holding a considerable volume of blood) As the primary cardiac pacemaker, the sinoatrial node excites itself rst The excitation then spreads from one cardiac muscle ber to another, due to the presence of intercalated (in-ter-KAY-lay-ted) discs between them These intercalated discs appear as thick dark lines when viewed through a compound microscope They are actually intercellular bridges inserted between (intercalat) adjacent cardiac muscle bers Thus, when the S-A node res o an action potential, this traveling wave of excitation moves from one cardiac muscle ber to another, across the intercalated discs connecting them end-toend Eventually, both atria become excited and contract And nally, both ventricles become excited
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SEMILUNAR VALVES
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After the ventricles are excited, their walls contract The blood in the right ventricle is pushed up into the common pulmonary artery through the right semilunar (sem-eye-LOO-nar) valve Likewise, the blood contained within the left ventricle is pumped up into the aortic arch through the left semilunar valve Both of these valves get their names from the shapes of their aps, which look like partial or half (semi-) moons (lun) This is re ected in their abbreviation, S-L Note back in Figure 163 that the myocardium is thicker in the walls of the ventricles, compared to the atria And observe that the myocardium is thickest of all in the wall of the left ventricle [Study suggestion: Ask yourself, Why is the myocardium thicker in the wall of the left ventricle, compared to that of the right ventricle Hint: What happens to a skeletal muscle when you repeatedly exercise it ]
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The Cardiac Cycle
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After the chambers of the heart are excited, they go into a state of systole (SIS-toh-lee) or contraction and emptying It is during systole that the blood is pumped from each of the ventricles, and out into their major arteries After systole, comes diastole (die-AH-stoh-lee) or relaxation and lling While the atria are still contracting in systole, the ventricles below
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CHAPTER 16 Blood and Circulatory System
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them are in a state of diastole, so that they receive blood through the right and left atrioventricular valves The Cardiac Cycle is one heart beat or one complete cycle of contraction (systole) plus relaxation (diastole) of all four chambers of the heart There are also at least two heart sounds that can be heard through a stethoscope placed onto the chest or back The 1st heart sound is commonly described as lubb It is due to closure of both A-V valves, which occurs when the ventricles start going into systole The ventricles push the A-V valve aps shut from below As a result, a back- ow of blood from the ventricles, and back up into the atria, is usually prevented The 2nd heart sound is usually represented as dupp This sound occurs because of the closing of both semilunar valves at the beginning of ventricular diastole The blood in the common pulmonary artery/aortic arch above each ventricle starts to fall back downward, due to the force of gravity As the blood falls down, it catches the semilunar valve aps and slams them shut, thereby preventing a back-leak into the ventricles [Study suggestion: Glance back at Fig 163, to help you visualize what s happening during the two heart sounds]
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HEART MURMURS
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Sometimes the heart valve aps do not t tightly together Consider what may happen after bacterial endocarditis (en-doh-car-DIE-tis) This disease involves an in ammation of (-itis) the inner (endo-) lining of the heart (cardi), due to infection with bacteria During the process of in ammation, the aps of certain valves (especially those of the left A-V valve) become swollen When the in ammation nally heals, the valve aps may become pulled back and distorted Thus, there is a turbulent (TUR-byuh-lunt) back- ow of blood a back ow which is highly disorderly and in a state of turmoil through the distorted and ill- tting heart valve aps The resulting noisy, abnormal heart sounds are called a heart murmur
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