Quiz 5 (Version = Key) ? EEOB 232 on 1 May 2007 1. The typical heart spends more time in the diastolic phase which is when the ventricles are relaxing. 3. Flow through a normal heart is pulmonary vein ? L atrium ? bicuspid valve ? L ventricle ? semilunar valve ? aorta ? body tissues then return to vena cava ? R atrium ? tricuspid valve ? R ventricle ? semilunar valve ? pulmonary artery ? lungs ? pulmonary vein. 5. Erythropoiesis is the production of red blood cells in the bone marrow, requires vitamin B12, iron and folic acid, and produces ~2 million erythrocytes a second. 7. Characteristic of arteries are that they carry blood from heart (both oxygenated or deoxygenated), have smooth muscles in the walls, and are highly elastic to dampen flow variation. 9. The correct direct sequence of action potential flow through the heart is the nervous system ? sinoatrial node ? atrial tissue ? atrioventricular node ? bundles of His ? Purkinje fibers ? ventricular tissue. 11. Correct statements about ESV are that it is the amount of blood after ventricular contraction, the minimum ventricular volume, smaller than the EDV, and determines the stroke volume. 13. The endothelial cells can cause vasoconstriction in the smooth muscle of the arterioles by releasing endothelin-1. 15. Correct matches of extrinsic control and impact on arterioles are norepinephrine vasoconstricts, nitric oxide vasodilates, angiotensin II vasoconstricts, and vasopressin vasoconstricts. 17. Correct characteristics of capillaries are that they have walls of only one endothelium thick, have decreased flow of blood, increased surface area, and a low hydrostatic pressure. 19. Increasing venous return slightly will lead to ? EDV, ? strength of contraction, ? ESV, and ?SV. 21. Increased blood pressure will NOT cause the secretion of vasopressin. 23. Correct components of cardiac muscle contraction are that the transverse tubules have voltage-gated calcium channels, the sarcoplasmic reticulum has ligand-gated calcium channels, calcium binding to troponin might not be from the sarcoplasmic reticulum, and calcium-ATPase pumps are in two locations. 25. The typical functions of plasma proteins are to establish the oncotic pressure (albumin and globulin), buffer the blood (albumin), participate in clotting (fibrinogen), act as plasma binding proteins (albumin), participate in the immune system (globulin). 27. A friend tells you she just learned from her doctor that her liver is destroying more red blood cells than normal causing her to have hemolytic anemia. 29. Yesterday, even though you were at the bus stop, the bus did not stop and caused you to miss physiology class. You definitely did not want the bus driver to miss you again this morning. When the bus driver came in to view, you started waving your right arm (your left hand was in your pocket). As a result of active hyperemia your left arm received less blood flow but due to flow autoregulation your liver received the same blood flow. 31. The left ventricle is the largest chamber of the heart because it needs to move blood the farthest. 33. You visit a friend in the hospital who has had a heart attack (i.e., damaged cardiac muscle). You observe his EKG and see that the P wave is the only normal appearing component. Your friend most likely damaged his ventricles. 35. Changing the conduction velocity of the myocardium will sometimes change the heart rate. 37. At your next check-up, your doctor tells you your blood pressure. You tell her that you now correctly know that the first (top) number is the systolic pressure (maximum pressure during ventricular contraction) and the second (bottom) number is the diastolic pressure (minimum pressure before ventricular contraction). 39. Unlike a typical individual, a person with a damaged atrioventricular (i.e., bicuspid or tricuspid) valve would have a murmur heard immediately after their ?lub.? CLB Monday Topics:
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