<prompt> Sinus bradycardia is seen in:AthletesExerciseThyrotoxicosisBeta adrenoceptor agonist  <response>: Sinus tachycardia is associated with a sinus rate of more than 100min. The various causes are,AnxietyFeverExerciseEmotionAnaemiaThyrotoxicosisBeta adrenoceptor agonistsSinus bradycardia is associated with a sinus rate of less than 60min and is seen commonly in athletes.Myocardial infarctionHypothyroidismCholestatic jaundiceRaised intracranial pressureBeta-blockersDigoxinVerapamil 