Welcome to your Edexcel AS Biology 4 Tiny vessels that link arteries and veins. Capillaries Veins Arteries ArteriolesSelect 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.What is the first step of expiration? Air flowing out of the lungs. Contraction of abdominal muscles. Relaxation of diaphragm muscles. Relaxation of external intercostal muscles.What is the respiratory organ of an earthworm? Body surface Gills Spiracles LungsAn advantage of gas exchange in water over the gas exchange in air. The movement of oxygen is faster in water than air. The respiratory surface does not dry out in water. Water usually contains a higher concentration of oxygen than air. Water moves over the respiratory surface very easily.Select the correct sentence regarding smoking. Tobacco was smoked until the end of 20th century. The World Health Organization (WHO) considers smoking to be a disease. Women started smoking at the end of 18th century. Manufacture of tobacco began after the cigarettes.The specific site of gas exchange in humans. Trachea Bronchus Alveoli LungsWhich is not a function performed by the stomach? Storage of food temporarily. Release of bile. Secretion of hormone gastrine. Secretion of gastric juice.A fluid secreted by the alveoli. Sinovial fluid Pericardial fluid Surfactant Pleural fluidNumber of openings in the right auricle. 1 2 5 3The mammalian circulatory system is a ___________. Closed double circulation Open double circulation Systemic circulation Pulmonary circulationSelect 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 have the thickest walls of any blood vessel. Arteries transport blood, swiftly and at high pressure to the tissues.When breathing, air is filtered, warmed and moistened in this organ. Nose Lungs Larynx AlveoliLungs are encased in thin membranes called ________. Pleura Rib cage Diaphragm Alveolar ductWhat is the advantage of a thin wall in a respiratory surface? Foreign particles will not pass through. Oxygen can dissolve easily. Exchange of nutrients may be possible. It facilitates the process of diffusion.Which of the following is not a function of surfactant? Facilitates the movement of blood. Restricts the constriction of alveoli. Reduces the surface tension on the alveolar surface. Acts as a moisturizer.Which of the following is not a component of gastric juice? Renin Secretin HCl Enzyme pepsinWhich of the following aids in stretching and recoiling of alveolar walls? Ciliated cells Goblet cells Secretary cells Elastic fibresWhich of the following is not a characteristic of a double circulation? Mixing of oxygenated and deoxygenated blood. Right side handles deoxygenated blood. Presence of 2 atria and 2 completely seperated ventricles. Left side handles oxygenated blood.Which 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.Time is Up!