biology f211 ocr as level anything 3.5 / 5 based on 7 ratings ? BiologyASAll boards Created by: DaniellaCreated on: 11-05-12 21:02 Why do multicellular organisms need transport systems? They have a small surface area to volume ratio, so cannot obtain glucose and oxygen from their outer membranes 1 of 13 An open circulatory system means... Blood flowa freely through the body cavity 2 of 13 The mammalian circulatory system is... Double 3 of 13 What is the name of the valve that attaches the pulmonary artery and the right ventricle? semilunar valve 4 of 13 What is the function of valves in the heart? To stop blood flowing the wrong way 5 of 13 Why has the left ventricle got the thickest walls? It needs to contract more powerfully to pump blood all around the body 6 of 13 If there's a higher pressure behind a valve, it's forced .... open 7 of 13 The ________ cycle pumps blood around the body. Cardiac 8 of 13 What is the name of the node that is in the right atrium that initiates the heartbeat? SAN- sino atrial node 9 of 13 Cardiac muslce is myogenic, what does this mean? It can contract and relax without recieving signals from nerves 10 of 13 The SAN is like a pacemaker, it sets the rythm of the heartbeat by sending out regular... waves of excitatiom 11 of 13 On an electrocardiograph, the main peak of the heartbeat is called the... QRS complex 12 of 13 xylem vessels transport... water and ions 13 of 13
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