Welcome to your CIE AS Transport in mammals The 'lub' sound of the heart is caused by the closure of which type of valves? Pulmonary semilunar Mitral Aortic semilunar AtrioventricularVessels carrying blood away from the heart. Capillaries Tubules Veins ArteriesWhich of the following is not a characteristic of a double circulation? Presence of 2 atria and 2 completely seperated ventricles. Right side handles deoxygenated blood. Mixing of oxygenated and deoxygenated blood. Left side handles oxygenated blood.Which is not an adaptation shown by people living permanently at high altitude? Larger heart, especially the right side Broad chests Different genetical composition Presence of more haemoglobin in blood than usualIn which heart chamber's wall does the electrical initiation of a heartbeat begin? Right ventricle Left ventricle Left auricle Right auricleSelect the incorrect statement regarding lymphatic system. The fluid inside lymphatics is called lymph. There are lymph nodes at intervals along lymph vessels. Lymphatics are tiny, blind-ending vessels, which are found in almost all tissues of the body. The valves in the lymph vessel walls are narrow and restricts the movement of large protein molecules.Vessels carrying blood towards the heart. Arteries Veins Tubes CapillariesSelect the correct statement(s) out of the followin: a)Red blood cells are shaped like a biconvex disc. b)Red blood cells are very small. c)Red blood cells are very flexible. d)Red blood cells have many mitochondria. a, b & c b, c & d b & c only a & d onlyWhat are the 3 layers of a heart? a) Endocardium b) Epicardium c) Pericardium d) Myocardium a, d & c c, b & d a, d & b a, b & cThe mammalian circulatory system is a ___________. Pulmonary circulation Open double circulation Closed double circulation Systemic circulationSelect the correct statement regarding carbon monoxide. Haemoglobin does not combine with carbon monoxide readily than it does with oxygen. Exhaust fumes from cars contain less amounts of carbon monoxide. Carboxyhaemoglobin is formed when carbon monoxide combines with haemoglobin molecules. Treatment for carbon monoxide poisoning involves multiple blood dialysis.Time is Up!