BIOC34H3 Lecture Notes - Muscarinic Acetylcholine Receptor, Oscilloscope, Atropine

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Activity 1: investigating the refractory period of cardiac muscle. Results: briefly describe what happened when you applied the electrical stimuli to the heart. (2 marks) There was a second beat that occurred when the stimulus was applied in the in the second half of the beat, just after the peak ended. This would then be followed by a compensatory pause (a longer period between beats). Give two marks for this brief description; adjust accordingly if it isn"t all there. Question 1: explain why the larger waves seen on the oscilloscope represent ventricular contraction. (1 mark) The ventricle has more muscle mass and therefore has the largest strength contractions. There are only two things that can contract; the atria and the ventricle and the ventricle is bigger and more muscular than the atria. Activity 2: examining the effect of vagus nerve stimulation. Results: briefly describe what happened when you electrically stimulated the vagus nerve. (2 marks)

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