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Browse the collection below. 1 a Explain the need for specialised exchange surfaces. 1 Exchange Surfaces Questions and model answers on Exchange Surfaces for the OCR AS Biology syllabus, written by the Biology experts at Save My Exams. Features of an efficient gas exchange surfaces include a large surface area, for instance the root hair cells or folded membranes, such as those of the mitochondria. Moist gas exchange surfaces to facilitate diffusion through dissolved oxygen. 1 e Questions and model answers on Cell Division, Cell Diversity & Cellular Organisation for the OCR A Level Biology syllabus, written by the Biology experts at Save My Exams. The transfer of culture and biology between the Old and New World that characterizes the Are you preparing for an upcoming test? 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Note that the 'viscosity' of a liquid refers to the ease with which it flows; a low-viscosity liquid flows easily, while a high-viscosity liquid flows less easily. uk for more awesome resources (OCR A Level Biology) Author: Meena Sundaram Chloride ions contribute to the production of mucus, ensuring that the mucus is at the correct viscosity within the airways. ocr. 1 Tick the boxes which correctly describe the conditions inside the capillary at positions A and B in Fig. With their structured format and ability to measure knowledge and understanding, MCQ te Alveoli have a large surface area in order to rapidly exchange gases, which is the primary function of the lungs. 1 d Explain the mechanism of ventilation in mammals. 1 Figure 6. Biology drawing skills handbook This guide will support students in developing their biological drawing skills. and others. 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They placed a small muslin bag of soda lime into the syringe and then added five germinating mung beans, which were held in place with the syringe plunger. 2 Gas exchange in mammals and plants. Remember, the xylem is on the inside of each bundle and the phloem on the outside. LARGE SURFACE AREA to ensure more gases diffuse across surface in a given time (alveoli) - root hair cells are covered in lots of microscopic hairs which increases their SA for water absorption by osmosis THIN MEMBRANES to decrease the diffusion distance which reduces time for exchange to occur- (walls of alveoli & capillaries once cell thick) GOOD BLOOD SUPPLY/ VENTILATION to maintain conc LARGE SURFACE AREA to ensure more gases diffuse across surface in a given time (alveoli) - root hair cells are covered in lots of microscopic hairs which increases their SA for water absorption by osmosis THIN MEMBRANES to decrease the diffusion distance which reduces time for exchange to occur- (walls of alveoli & capillaries once cell thick) GOOD BLOOD SUPPLY/ VENTILATION to maintain conc Nov 13, 2023 · A Level Biology Quiz Collections . Questions and model answers on Nucleotides & Nucleic Acids for the OCR A Level Biology syllabus, written by the Biology experts at Save My Exams. 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Whether you’re a student, a professional, or simply an individual look If you’re a Temu customer and find yourself in need of assistance, you may have questions about how to reach their customer service. Effective exchange surfaces in organisms have: A large surface area. elastic in walls can recoil to expel air which helps ventilation 4. Scientists have suggested that cirrhosis can be detected by taking samples of body fluids and testing them for two different molecules: C-reactive protein and copeptin. 1 shows one person’s immune response to the influenza virus when they were first infected and when they were infected two years later by a new, mutated strain of the virus. More able candidates added that this enabled the frog to absorb more oxygen from the water. squamous epithelium provide short diffusion distance 3. 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