Biology Crossword

2. Transport medium that carries substances between different parts of the body.
3. Alcohol formed as a product of anaerobic respiration in certain microorganisms.
5. Simple sugar that serves as an important respiratory fuel.
9. Tissues that contract to produce movement and require energy to do so.
12. Describes a form of respiration that depends on a particular gas to release energy efficiently.
16. Muscular organ that continuously pumps a transport fluid around the body.
17. Activity that causes muscles to demand more oxygen and respiratory fuel.
18. Digestive enzyme that breaks a large carbohydrate into smaller sugar molecules.
19. Organ involved in regulating blood glucose levels and processing substances absorbed from digestion.

1. Organelle in cell with a high demand for respiration.
3. What cells obtain from respiration to power essential life processes.
4. Microscopic units that make up living organisms and carry out life processes.
6. Nutrient group that includes sugars and starches and can provide respiratory substrates.
7. Describes respiration that occurs when oxygen is unavailable or insufficient.
8. Pair of organs where gases are exchanged between inhaled air and the bloodstream.
10. Physical movement of air into and out of the respiratory system.
11. Jelly-like region of a cell where anaerobic respiration begins.
13. Sudden, involuntary and often painful contraction of a muscle.
14. One of the substances formed when glucose undergoes complete aerobic respiration.
15. Gas required for the most efficient form of cellular respiration.