Biological Molecules & Circulatory System

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Across
  1. 3. A macromolecule made of amino acids, used for growth, repair and enzyme production (contains C, H, O, N).
  2. 9. Tiny, thin-walled blood vessels that connect arteries and veins; site of exchange of nutrients, oxygen and waste between blood and body cells.
  3. 10. The simplest carbohydrate (e.g., glucose, fructose), the building block of larger carbohydrates.
  4. 11. A macromolecule made of fatty acids and glycerol (contains C, H, O), used for energy storage, insulation and cell membrane structure.
  5. 12. A blood vessel that carries blood away from the heart (usually oxygenated blood, except pulmonary artery).
  6. 13. The upper chambers of the heart that receive blood from the body or lungs.
  7. 14. The lower chambers of the heart that pump blood out of the heart to the body or lungs.
  8. 16. Blood that contains a high concentration of oxygen (bright red).
  9. 18. A polysaccharide stored in animal cells (e.g., in liver and muscles), used as a short-term energy reserve.
  10. 20. The bond that links amino acids together to form proteins.
  11. 21. A blood vessel that carries blood towards the heart (usually deoxygenated blood, except pulmonary vein).
  12. 22. A protein that acts as a biological catalyst, speeding up chemical reactions in cells without being used up.
Down
  1. 1. Acid The building block of proteins, joined together by peptide bonds.
  2. 2. A carbohydrate made of two monosaccharides joined together (e.g., sucrose = glucose + fructose).
  3. 4. A large carbohydrate made of many monosaccharides joined together (e.g., starch, glycogen, cellulose).
  4. 5. A macromolecule made of carbon, hydrogen and oxygen (ratio 2:1 H:O), used as the main energy source for cells.
  5. 6. Structures in the heart and blood vessels that prevent the backflow of blood.
  6. 7. Blood that contains a low concentration of oxygen (dark red).
  7. 8. A muscular organ that pumps blood around the body, acting as a pump.
  8. 15. A polysaccharide that forms the cell wall of plant cells, providing support and structure.
  9. 17. Tubes that carry blood around the body (arteries, veins, capillaries).
  10. 19. A polysaccharide stored in plant cells (e.g., in potatoes), used as an energy reserve.