Markscheme A 48. [1 mark] Where are structures I, II and III found in the human body? Markscheme B 49. [1 mark] What is the function of thrombin in the process of blood clotting? A. It acts as a catalyst.B. It the wound to trap blood cells.C. It changes from a soluble protein to an insoluble fibrous protein.D. It releases clotting factors from platelets. Markscheme A 50. [1 mark] Which element or ion is required for transmission of a nerve impulse? A. Phosphorous B. Sodium C. Sulfur D. Iron Markscheme B 51. [1 mark] A structure has a thin epithelium of one cell layer and contains a lacteal and blood capillaries. It has protein channels and mitochondria to aid absorption. What is this structure? A. Alveolus B. Gastric gland C. Pancreas D. Villus Markscheme D
Markscheme A 48. [1 mark] Where are structures I, II and III found in the human body? Markscheme B 49. [1 mark] What is the function of thrombin in the process of blood clotting? A. It acts as a catalyst.B. It the wound to trap blood cells.C. It changes from a soluble protein to an insoluble fibrous protein.D. It releases clotting factors from platelets. Markscheme A 50. [1 mark] Which element or ion is required for transmission of a nerve impulse? A. Phosphorous B. Sodium C. Sulfur D. Iron Markscheme B 51. [1 mark] A structure has a thin epithelium of one cell layer and contains a lacteal and blood capillaries. It has protein channels and mitochondria to aid absorption. What is this structure? A. Alveolus B. Gastric gland C. Pancreas D. Villus Markscheme D
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