Cardiovascular system 2 Easy and simple questions in human physiology of cardiovascular system Omneya published on August 28, 2018 Stacked 1/28 1.The Second heart sound is due to.. A. Closure of the AV valves B. Clousure of semilunar valves C. Closure of all valves D. Opening of AV valves E. Venticular contraction 2/28 2.Baroreceptores of carotid sinus and aortic arch are sensitive to A. Increase in systolic pressure B. Increase in venous pressure C. Increase in pulse pressure D. Increase in venticular pressure E. All are correct 3/28 3.Hypercalcemia (increase Ca2 in the ECF) CAN stop the heart in systole due to A. The heart rate markedly increased by calcium ions B. A calcium ion is essential for relaxation of the cardiac muscle C. The cardiac muscle depend on the intracellular Ca2 for contraction D. The stroke volume is markedly increased by calcium ions E. Increased Ca influx prolong the plateau phase 4/28 4.The rapid mechanism for controlling arterial blood pressure A. Is hormonaly mediated B. Act in minute C. Is mediated mainly via the Baroreceptores D. Stimulates vasoconstrictor hormones E. All are correct 5/28 5.Impulse makes the heart to beat orginates in the A. SA node B. Purkinje system C. Left bundle branch D. Ventricle E. AV node 6/28 6.Regarding the pace maker potential.. A. Resting potential is -70m V B. The prepotential caused by decreased K+ permeability C. Depolrization is due to sodium influx D. Plateau phase caused by T-type calcium channels E. It is not a real potential 7/28 7.The slowest conduction velocity is in the.. A. SA node B. Internodal pathway C. Bundle of his D. Purkinje system E. AV node 8/28 8.When the radius of a blood vessel is doubled the resistance will A. Not change B. Increase 16 times C. Increase 4 times D. Decrease 16 times E. Decrease 4 times 9/28 9.It is impossible to tetanize a heart because A. There is a long refractory period B. The refractory period and the mechanical contracitle response are almost equivalent duration C. The heart muscles do not contain Ca++ D. The mechanical contracitle event is usually sborter than the duration of the electrical Depolrization E. None is true 10/28 10.Y wave in jugular venous pulse occurs in A. Isometric contraction phase B. Early filling of right ventricle C. Atrial systole D. Venous filling of RA E. Atrial relaxation 11/28 11.Increasing vagal stimulation of the heart will cause an increase in.. A. Heart rate B. PR interval C. Venticular contracility D. Ejection fraction E. Cardiac output 12/28 12.The P wave of the ECG occurs.. A. Before atrial contraction B. The end of atrial contraction C. The beginning of venticular contraction D. The end of venticular contraction E. None of the above 13/28 13.Propagation of the action potential through the heart is fastest in the.. A. SA node B. Atrial muscle C. AV node D. Purkinje fibers E. Venticular muscle 14/28 14.The strength of contraction of left ventricular muscle increases when.. A. End diastolic venticular filling pressure rise B. Serum potassium level rises C. Blood calcium level fall D. Strenuous exercise is undertaken E. Peripheral resistance is increased 15/28 15.AV valves are opened in A. Isometric contraction phase B. Atrial systole phase C. Pro diastolic phase D. Maximum ejection phase E. Never open in the cardiac cycle 16/28 16.Which of the following is not a feature of mitral stenosis.. A. Loud firist heart sound B. Pulmonary hypertension C. Right venticular hypertrophy D. Third heart sound E. Opening snap 17/28 17.The aortic valve closed when.. A. the pressure in the left ventricle rises above the pressure in the aorta B. Venticular systole begins C. ventricular systole ends D. When the pressure in the left ventricle decreases Both A and B Both C and D All are correct 18/28 18.The most affected valve in RHF Aortic valve Tricuspid valve Mitiral valve Pulmonary valve All of the above 19/28 This is the correct sequence of structures that allows the normal sequence of excitation to progress through the heart. Bundle of His - Purkinje fibres - AV node SA node - Purkinje fibres - AV node - Bundle of His Purkinje fibres - AV node - SA node - Bundle of His SA node - AV node - Bundle of His - Purkinje fibres Bundle of His - SA node - AV node - Purkinje fibres 20/28 Which of the below factors would increase stroke volume? Increased preload, increased afterload, increased contractility Decreased preload, decreased afterload, decreased contractility Increased preload, decreased afterload, increased contractility Decreased preload, increased afterload, increased contractility Increased preload, increased afterload, decreased contractility 21/28 This is a network of specialised cardiac muscle fibres that provide a path for each cycle of cardiac excitation to progress through the heart. Pacemaker Sinoatrial node Purkinje fibres Conducting system Bundle of His 22/28 This electrical event triggers contraction of the atria. R wave T wave S wave P wave Q wave 23/28 Which of these periods represents greatest cardiac output? Atrial diastole Ventricular diastole Atrial systole Ventricular systole Septal systole 24/28 This electrical event represents repolarization of the ventricle. R wave T wave S wave P wave Q wave 25/28 Through which structure does blood pass from the right atrium to the right ventricle? Bicuspid valve Interventricular septum Tricuspid valve Mitral valve Ascending aorta 26/28 In this disorder the aortic valve is narrowed. Aortic insufficiency Rheumatic fever Mitral valve prolapse Aortic stenosis Aortic regurgitation 27/28 This is the volume of blood ejected from the left ventricle into the aorta each minute. Cardiac output Cardiac input Stroke volume Heart rate Auscultation 28/28 The second heart sound represents which of the below events? Valvular stenosis Semilunar valves opening Atrioventricular valves closing Semilunar valves closing Atrioventricular valves opening
