Bio 277L Summer 2018 Name: Critical Thinking Assignment 4: Electrocardiography 1

Question

Bio 277L Summer 2018 Name: Critical Thinking Assignment 4: Electrocardiography 1. Fill in the following table with the missing information about these electrocardiograms. For the name of the condition choose from: tach box) ycardia, ventricular fibrillation, or 2d degree heart block) (2 pts per Name of Condition Possible cause Name 1 characteristic Example Anxiety, WPW syndrome, overactive thyroid No organized activity, no cardiac output or pulse Sinus bradycardia More P waves than QRS complexes 2. A heart will continue to beat, even if there were no action potentials coming from the brain or spinal nerves. Why is this? (2 pts) 3. What will happen to the rate of contraction of the ventricle, if there is no signal coming from the sinoatrial node, and why? (2 pts) 4. What is hyperkalemia, and how would it affect resting membrane potential, and ability of excitable cells to reach threshold? (3 pts)

Explanation / Answer

Ans.1.

Ans.2.

Heart is not regulated by brain or Spinal cord but has its own conduction system i.e pacemaker system (SA node), which keeps on firing at regular intervals and causes heart to beat.

Name of condition Possible cause Name one characteristic Tachycardia Anxiety, WPW syndrome, overactive thyroid Heart Rate greater than or equal to 100 Ventricular Fibrillation Cardiomyopathy, Ischemic heart disease No organised activity, no cardiac output or pulse Sinus Bradycardia Sick Sinus syndrome, Low Thyroid levels, medicines like beta blockers Heart rate less than 60 beats per minute 2nd degree heart block Coronary heart disease, Cardiomyopathy, congenital heart disease More P waves than QRS complexes

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