Science

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Across
  1. 4. a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.
  2. 6. an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).
  3. 9. (of protozoans, certain algae, spores, etc.) consisting of a single cell.
  4. 12. any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body.
  5. 14. any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart.
  6. 15. a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane.
  7. 18. a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.
  8. 19. blood cells A type of blood cell that is made in the bone marrow and found in the blood. Red blood cells contain a protein called hemoglobin, which carries oxygen from the lungs to all parts of the body.
Down
  1. 1. Artery the artery carrying blood from the right ventricle of the heart to the lungs for oxygenation.
  2. 2. (of an organism or part) having or consisting of many cells.
  3. 3. (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place.
  4. 5. the great arterial trunk that carries blood from the heart to be distributed by branch arteries through the body
  5. 7. any of the fine branching blood vessels that form a network between the arterioles and venules.
  6. 8. Vein a vein carrying oxygenated blood from the lungs to the left atrium of the heart.
  7. 10. a short microscopic hairlike vibrating structure found in large numbers on the surface of certain cells, either causing currents in the surrounding fluid, or, in some protozoans and other small organisms, providing propulsion.
  8. 11. any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.
  9. 13. a partition separating two chambers, such as that between the nostrils or the chambers of the heart.
  10. 14. a membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, that maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow.
  11. 16. a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.
  12. 17. blood cells White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders.