vocab

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Across
  1. 3. nervous system (PNS): consists of all nerves outside the brain and spinal cord
  2. 4. neurons: specialized nerve cells in the peripheral nervous system
  3. 5. any of the elongated contractile threads found in striated muscle cells.
  4. 9. a thin, two-layered serous membrane
  5. 11. branched, tree-like extensions of neurons that receive electrochemical signals from other neurons
  6. 12. the microscopic structural and functional unit of the kidney
  7. 13. microscopic air sacs at the end of this tree for gas exchange
  8. 14. The main artery of the body.
  9. 17. neuron: specialized nerve cells originating in the brain
  10. 18. the shortest and widest segment of the small intestine.
  11. 19. primary transmission cable of the nervous system
Down
  1. 1. neurons:specialized nerve cells in the brain and spinal cord that transmit signals
  2. 2. the automatic relaxation of muscles in the digestive tract and other tubular organs.
  3. 6. airways branching into lungs
  4. 7. a tube that transfers urine out of the body
  5. 8. natural waste product of protein
  6. 10. a stiff flap at the base of the tongue.
  7. 15. artery: the essential blood vessels that supply oxygen-rich blood. directly to the heart muscle.
  8. 16. marrow: vascular tissue inside the bone.
  9. 20. junction: a specialized chemical synapse bridging motor neurons and skeletal muscle fibers