Welcome to your Edexcel AS Biology 4 Tiny vessels that link arteries and veins. Arterioles Arteries Veins CapillariesSelect the correct sentence regarding smoking. The World Health Organization (WHO) considers smoking to be a disease. Tobacco was smoked until the end of 20th century. Women started smoking at the end of 18th century. Manufacture of tobacco began after the cigarettes.A fluid secreted by the alveoli. Pleural fluid Pericardial fluid Surfactant Sinovial fluidLungs are encased in thin membranes called ________. Rib cage Pleura Diaphragm Alveolar ductWhat is the advantage of a thin wall in a respiratory surface? It facilitates the process of diffusion. Foreign particles will not pass through. Exchange of nutrients may be possible. Oxygen can dissolve easily.Number of openings in the right auricle. 1 3 2 5What is the first step of expiration? Relaxation of external intercostal muscles. Air flowing out of the lungs. Contraction of abdominal muscles. Relaxation of diaphragm muscles.When breathing, air is filtered, warmed and moistened in this organ. Alveoli Lungs Nose LarynxWhich of the following aids in stretching and recoiling of alveolar walls? Ciliated cells Secretary cells Elastic fibres Goblet cellsWhich of the following is not a component of gastric juice? HCl Secretin Renin Enzyme pepsinWhich of the following is not a reason for the evolvement of respiratory surfaces with high AV ratios? Animals became nocturnal. Animals grew big in size. Animals became complex in structure. Animals became more active.Which of the following is not a characteristic of a double circulation? Right side handles deoxygenated blood. Presence of 2 atria and 2 completely seperated ventricles. Left side handles oxygenated blood. Mixing of oxygenated and deoxygenated blood.The specific site of gas exchange in humans. Bronchus Trachea Alveoli LungsWhich is not a function performed by the stomach? Release of bile. Secretion of gastric juice. Secretion of hormone gastrine. Storage of food temporarily.An advantage of gas exchange in water over the gas exchange in air. The respiratory surface does not dry out in water. The movement of oxygen is faster in water than air. Water moves over the respiratory surface very easily. Water usually contains a higher concentration of oxygen than air.Select the incorrect statement regarding arteries. The walls of arteries are made up of 2 layers. The walls of arteries possess high strength and elasticity. Arteries transport blood, swiftly and at high pressure to the tissues. Arteries have the thickest walls of any blood vessel.Which of the following is not a function of surfactant? Acts as a moisturizer. Facilitates the movement of blood. Restricts the constriction of alveoli. Reduces the surface tension on the alveolar surface.The mammalian circulatory system is a ___________. Systemic circulation Closed double circulation Pulmonary circulation Open double circulationWhat is the respiratory organ of an earthworm? Gills Lungs Spiracles Body surfaceSelect the incorrect statement regarding COPD. In older people, recovery from COPD is not possible. The WHO predicts that COPD will become the No 1 leading cause of death worldwide by 2030. COPD occurs when the lungs become inflamed, damaged and narrowed. Over 60 million people worldwide have COPD.