Welcome to your OCR AS Biology 5 Which animal phylum was the first to evolve with special respiratory organs? Phylum Arthropoda Phylum annelida Phylum Echinodermata Phylum MolluscaWhat happens to the gases inhaled apart from oxygen? They are converted to oxygen by the lungs. They are exhaled. They get absorbed by the digestive system. They circulate throughout the body and are disposed of later.Select the incorrect statement regarding COPD. In older people, recovery from COPD is not possible. Over 60 million people worldwide have COPD. COPD occurs when the lungs become inflamed, damaged and narrowed. The WHO predicts that COPD will become the No 1 leading cause of death worldwide by 2030.What is the first step of expiration? Relaxation of external intercostal muscles. Contraction of abdominal muscles. Relaxation of diaphragm muscles. Air flowing out of the lungs.How does the oxygen move from the lungs into the blood stream? Veins A large artery Nerve fibres Small blood vesselsWhich is not a function performed by the stomach? Storage of food temporarily. Secretion of hormone gastrine. Secretion of gastric juice. Release of bile.The body structure which protects the lungs from physical harm. Bronchus Diaphragm Cartilage Rib cageAdaptation of some insects to reduce water loss. Presence of antennae Less number of legs Exoskeleton Large surface area to volume ratioHow is Vitamin B12 absorbed into the body? By micelles It is digested by gastric juices. Vitamin B12 is absorbed into the veins by diffusion. The stomach secretes an intrinsic factor.Which of the following is not a reason for the evolvement of respiratory surfaces with high AV ratios? Animals became nocturnal. Animals became complex in structure. Animals grew big in size. Animals became more active.What happens when carbon monoxide concentration increases in the blood? Heart rate increases. Decrease in blood supply to the extremeties of the body. Blood pressure is increased significanty. The quantity of oxygen transported in the blood reduces.Select the correct statement/s from the following. a) Human heart is a hollow muscular organ. b) It is a major component of human circulatory system. c) It is about the size of it's owner's fist. d) It consists of 2 layers. a & b only All a, b & c a, c & dLungs are encased in thin membranes called ________. Pleura Alveolar duct Diaphragm Rib cageWhich of the following is not a function of bile salts? Providing colour to faeces. Helping in the absorption of fatty acids and glycerol. Neutralizes the acidity of chyme. Acting as a buffer.What is the respiratory organ of a mosquito? Body surface Book lungs Lungs Spiracles and tracheaSelect the correct sequence of steps which shows the movement of oxygen through an insect. a) Spiracle closes. b) Oxygen is delivered directly to respiring tissues. c) Oxygen diffuses through the trachea into the tracheoles. d) Oxygen enters the insect through spiracles and into the trachea. d, b, a, c d, a, c, b a, d, c, b b, a, c, dWhich of the following statement is correct regarding the location of human heart? It is situated right beneath the thoracic cavity. It is situated more towards the left side from the midline. It is situated more towards the right side from the midline. It is situated right in front of the sternum.What are the 3 layers of a heart? a) Endocardium b) Epicardium c) Pericardium d) Myocardium c, b & d a, b & c a, d & b a, d & cWindpipe is also known as the _________. Oesophagus Larynx Trachea LungsSelect the incorrect statement regarding the system of trachea in insects. The air is taken directly upto the cells. Gaseous exchange is not very efficient. It is a highly branched tubular system. It opens to the exterior through spiracles.