Aqa Gcse Combined Science Trilogy B2 Study Guide Rated A+

Structure of phloem {Ans: Tubes of elongated cells. Cell sap move from one phloem cell to another through pores in end walls}Ventillation {Ans: Contraction and relaxation of intercostal muscles}Transpiration {Ans: Brings water into leaf for photosynthesis and also evaporates water from the leaf to cool it down}Tissue {Ans: Group of cells with a similar function}Liver(digestive system) {Ans: Produces bile which neutralises acid from stomach and speeds up digestion of lipids}Aorta {Ans: Oxygenated blood pumped from heart to body}Sperm cell specialised {Ans: Acrosome- contains enzymes in head to digest through egg cell membrane Mitochondria- transfer energy to tail Tail- to swim to egg}How lungs adapted for gaseous exchange {Ans: Clusters of alveoli provide large surface area and rich supply of capillaries. Gases can diffuse in and out of blood}Malignant tumours {Ans: Invade neighbouring tissues and move into bloodstream and spread to form secondary tumours.}Spongy mesophyll {Ans: Full of air spaces for c02 to diffuse from stomata to spongy mesophyll to palisade cells}Digestion {Ans: Large food molecules broken down to smaller ones by enzymes which is then absorbed to the bloodstream}Proteins(digestive enzymes) {Ans: Broken down by proteases to form amino