Aqa Gcse Combined Science Trilogy B2 |63 Questions| With Correct Answers.

Transpiration {Ans: Brings water into leaf for photosynthesis and also evaporates water from the leaf to cool it down}Veins {Ans: Carries blood into the heart}Arteries {Ans: Narrow to keep pressure in arteries at high level}Nerve cell specialised {Ans: Dendrites- connect to other cells Myelin sheath- insulate electrical impulses Axon- long conducts electrical impulses in one direction Synapse- send neurotransmitter chemicals to nerve cell or effector}Disadvantages of bone marrow {Ans: Painful procedure Can only differentiate to form blood cells Risk of infection}coronary arteries {Ans: Provide oxygen to muscle cells of heart used in respiration for contraction}