Recent Biology test improvment 0.0 / 5 ? BiologyCells, tissues and organsRespiration and exerciseEnzymes and digestionGCSEAQA Created by: Tomtom25Created on: 12-03-17 18:47 Topic: Cells, Tissues and Organs What part of the heart does deoxygenated blood from enter Vena Cava 1 of 6 Topic: Diffusion in respiration Describe how oxygen enters the blood. With diffusion when the oxygen moves from a higher concentration in the alveoli to a lower concentration in the bloodstream 2 of 6 Topic: Enzymes and digestion Why can't the enzyme pepsin work at a pH of 7? Pepsin is adapted to working in acidic conditions (pH 1-4) and so de-naturalises at pH 5 or higher 3 of 6 Topic: Cells, Tissues and Organs . 4 of 6 Topic: Diffusion in respiration . 5 of 6 Topic: Enzymes and digestion . 6 of 6
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