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No.QuestionSubjectLevelStatus
061 The first heart sound is produced mainly by which event?Cardiac cycle · MBBS university exams pattern Physiology 062 During the isovolumetric contraction phase of the cardiac cycle, what is the state of the heart valves?Cardiac cycle · MBBS university exams pattern Physiology 063 The dicrotic notch (incisura) on the aortic pressure curve corresponds to which event?Cardiac cycle · MBBS university exams pattern Physiology 064 In a healthy adult at rest, most ventricular filling occurs during which phase?Cardiac cycle · MBBS university exams pattern Physiology 065 The plateau (phase 2) of the ventricular action potential is due mainly to which ion movement?Cardiac electrophysiology · MBBS university exams pattern Physiology 066 In which part of the cardiac conducting system is conduction velocity slowest?Cardiac electrophysiology · MBBS university exams pattern Physiology 067 Cardiac muscle cannot be tetanised. Which property explains this?Cardiac electrophysiology · MBBS university exams pattern Physiology 068 A subject has a heart rate of 70 beats/min, an end-diastolic volume of 120 mL and an end-systolic volume of 50 mL. What is the cardiac output?Cardiac output and haemodynamics · MBBS university exams pattern Physiology 069 According to the Frank–Starling law, an increase in venous return raises stroke volume primarily by which mechanism?Cardiac output and haemodynamics · MBBS university exams pattern Physiology 070 Afferent impulses from the carotid sinus baroreceptors travel to the medulla in which nerve?Blood pressure regulation · MBBS university exams pattern Physiology 071 Which change shifts the oxygen–haemoglobin dissociation curve to the right?Respiratory physiology · MBBS university exams pattern Physiology 072 The central chemoreceptors in the medulla respond most directly to which stimulus?Respiratory physiology · MBBS university exams pattern Physiology 073 Pulmonary surfactant is secreted by which cells?Respiratory physiology · MBBS university exams pattern Physiology 074 In which segment of the nephron is the largest fraction of filtered sodium reabsorbed?Renal physiology · MBBS university exams pattern Physiology 075 Antidiuretic hormone increases water reabsorption by which mechanism?Renal physiology · MBBS university exams pattern Physiology 076 The resting membrane potential of a nerve fibre is determined mainly by the membrane's permeability to which ion?Nerve, muscle and endocrine · MBBS university exams pattern Physiology 077 In skeletal muscle, calcium initiates contraction by binding to which protein?Nerve, muscle and endocrine · MBBS university exams pattern Physiology