Welcome to your OCR AS Biology 4 What is the unit of blood pressure? cu ft/hr L/min mmHg ppmTiny vessels that link arteries and veins. Arteries Capillaries Arterioles VeinsWhich of the following is a bile salt? Potassium ions Na/K torocolate HCl BiliverdinWhich of the following digests DNA? Ribonucleases Deoxyribonucleases Bile salts AmylaseAn animal phylum which possesses an open circulatory system. Annelida Chordata Arthropoda EchinodermataA distinct feature of a closed circulatory system. The blood flows through veins. The blood is pumped by the heart. The blood flows away from the heart. Exchange of materials take place through capillary walls.The 2 components of tobacco smoke that cause short term effects on the cardiovascular system. Nicotine and carbon monoxide Carbon monoxide and hydrogen cyanide Nicotine and ammonia Carbon monoxide and ammoniaThe hormone which facilitates the release of bile. Cholecystokynine Enterogasterone Pancryocine SecretineThe closest membrane to the heart muscle. Visceral pericardium Fibrous pericardium Pericardial sac Parietal pericardiumWhich of the following is a treatment option for lung cancer? a. Radiotherapy b. Surgery c. Organ transplant d. Chemotherapy e. Cryotherapy b, d & c a & d only a, d & e b, a & dWhich is not an effect of nicotine? It stimulates the nervous system. It helps in releasing the hormone adrenaline. It helps in reducing the diameter of arterioles. It dicreases the risk of blood clotting.Which of the following methods are used to locate tumours in the lungs? Angiography Blood test Ultrasonography CT scanTreatment options for lung cancer is dependant on the following factors. a. Type of lung cancer. b. Occurance of metastasis. c. History of genetic diseases. d. Severity of the disease. a & c only a & d only a, b & d b, c & dWhat is the function of renin? Digestion of iron compounds. Coagulation of proteins. Synthesis of bile. Absorption of alcohol and medicines.Which compound is formed when carbon monoxide combines with haemoglobin? Carboxyhaemoglobin Oxycarbohaemoglobin Oxyhaemoglobin CarbohaemoglobinSelect the correct statement regarding lung cancer. People with lung cancer do not get chest pain. Lung cancer takes 5-10 years to develop. The most common symptom of lung cancer is coughing up blood. People with lung cancer breathe with ease.Which of the following is not a characteristic of a double circulation? Presence of 2 atria and 2 completely seperated ventricles. Left side handles oxygenated blood. Mixing of oxygenated and deoxygenated blood. Right side handles deoxygenated blood.Number of openings in the right auricle. 1 3 2 5Which artery arises from the right ventricle? Aorta Pulmonary artery Subclavian artery Carotid arteryWhich of the following is incorrect regarding a mammalian heart? Mammals have got right half of the systemic arch. The heart consists of 4 chambers. The heart could be divided into 2 equal halves. Displays a complete double circulation.