The Heart The heart and exercise 3.0 / 5 based on 2 ratings ? BiologyHuman, animal and plant physiologyA2/A-levelEdexcel Created by: Niki :)Created on: 12-03-13 17:18 The sinoatrial node sets up a wave of __________ which cases atrial contraction. depolarisation 1 of 8 What does the QRS complex on an electrocardiogram represent? ventricular systole 2 of 8 cardiac output = heart rate x _____________ stroke volume 3 of 8 During exercise there is greater muscle action so more blood returns to the heart. This is known as ________ venous return 4 of 8 The sympathetic and parasympathetic systems are part of the _____________ nervous system. autonomic 5 of 8 The hormone __________ is produced under stress, causing the arterioles to dilate, supplying extra oxygen and glucose to the muscles. adrenaline 6 of 8 ____________ stretch when blood pressure in the arteries increases. They send nerve impulses to the cardiovascular centre to lower the blood pressure. baroreceptors 7 of 8 The atrioventricular node sends the wave of electrical excitation to the _________ bundles of His 8 of 8
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