Exam (elaborations)
HTHSCI 1H06 Winter Midterm (McMaster University)
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HTHSCI 1H06 Winter Midterm (McMaster University)
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1-39 of 39(1) only area that ap can be conducted from atria to ventricles
(2) larger vessels at apex that ap continues down
AV node --> bundle of his --> R and L bundle branches --> interventricular septum -->
pukinje fibres --> ventricles
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(1) bundle of his
(2) purkinje fibres
,(1) supplies heart with blood ASAP
(2) anterior, within interventricular sulcus, lying with LAD in groove, ends in dilated
structure called the coronary sinus
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(1) coronary veins
(2) great cardiac vein
(1) increase calcium and contraction of tissue
(2) decrease calcium, contraction decreases
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(1) positive inotrope
(2) negative inotrope
(1) heart, ascending aorta, pulmonary trunk and phrenic nerves
(2) thymus gland
(3) descending aorta, esophagus, lymph nodes, vagus nerve and thoracic duct
(4) aortic arch, esophagus and trachea
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(1) middle region
(a) anterior (front) region
(3) posterior region
(4) superior (top) region
, record of AP that occurs across heart muscle fibres
(1) depolarization of atria
-slows at AV node
(2) depolarization of ventricles
-stimulate ventricular cardiomyocyte, contraction = QRS complex
(3) repolarization of ventricles
(4) rebounding of blood off semilunar valves when they're closing
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ECG
(1) P wave
(2) QRS wave
(3) T wave
(4) dicrotic wave
(1) - 0.05 sec, volume of blood in chambers remains the same --> atria is empty
- all 4 valves closed, after atrial contraction
(2) - volume of blood in chambers is same, all 4 valves closed
- after ventricular relaxation
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(1) isovolumetric contraction
(2) isovolumetric relaxation
(1) fossa ovalis - because of increase pressure in LS valve closes
(2) ligamentum arteriosum - loss of prostaglandin (vasodilator), closes 24-48 hours
after birth
(3) ligamentum venosum - turns into ligament within 3 months
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