oir Which condition is the resalt of heart valvels) not 18. which ofthe filiwing
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oir Which condition is the resalt of heart valvels) not 18. which ofthe filiwing contributes so the midi ening properly? a Porpligtin ring of the heme gsup b Carbon Diosade besnd to ion b. Stenosis c. Prolapse d. Regurgitation e. Insufficiency dAlipis Chains 19 What kind of heart failure is associated with imues of emptying the heart 13. Why are capillaries unable to vasoact? a. They lack sufficient smooth muscle b. The composition of their surroundings never a. Valvalar changes c. They are too small d. Vasoaction would reverse blood flow e. None of the above only veins cannot vasoact 20. How many chambers does the heart have? 14. The major contribution to resistance to blood flow in a vessel is the a. Strength of blood vessel b. pH of the blood d fosr d. Radius of the vessel e. Percentage of red blood cells 15. The condition known as polycythemia indicates an elevated level of what ion enters the cel a. Chlorids a Plasma Volume b. Free heme c. Oxygen d. RBCs e. Cythemes c ATP d Calcim .Sodism 22. What siructures alliow for action potentiais to spread ea between ordinary candiac muscle cells hat kind of a pamp is the heart? single pump bicuspid pump c. ventricular pump d. double (dual) pump equadruple pump a Bundle Branches b. Nodes Gap Junction d. Bundles of His e. Purkinje Fbers 17. The exposure of which protein at the site of injury is a necesary step for the process of wound healing 23. Under resting conditions, wat fraction of capillary b are perfused a. Collagen b. Fibrinogern c. von Willebrand factor b. 1/2 d. Hemoglobin e. Na/K ATPase d. 13 . 23Explanation / Answer
12. Valvilar stenosis occurs when the valves are not completely open. This hampers the flow of blood through the value. Cause of such condition is thickening or stiffening of the heart valves.
Option b is right.
13 Vasoaction requires smooth muscles. It is the constriction or dilation of smooth muscles that causes vasoaction. As capillaries lack smooth muscle, they cannot vasoact.
Option is a.
14. Resistance to blood flow in a vessel depends on vessel diameter (or radius), vessel length and viscosity of the blood. Of these, vessel radius is the most important parameter, as constriction of the vessel will reduce radius, which will reduce blood flow.
Option is d.
15. In Polycythemia, the number of red blood cells increases due to increased serum erythropoietin that regulates RBC production.
Option is d.
16. The heart is a ventricular pump. The right ventricle pumps blood to the lungs while the left ventricle pumps blood to rest of the body. The atrium pumps blood to the ventricles and are weaker than the ventricles.
Option c is right.
17. Fibrinogen plays a crucial role in wound healing. Fibroblasts rush to site of wound and will release fibrinogen to heal the site of injury.
Option b is right.
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