ORGANS AND ORGAN SYSTEMS

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Across
  1. 3. The smallest blood vessels are called __________.
  2. 4. After food is chewed and swallowed, it goes down the __________ and enters the stomach.
  3. 9. There are four main types of tissues in animals, epithelial, connective, muscle and __________.
  4. 10. __________ are also called air sacs.
Down
  1. 1. The principal cell of connective tissues is the __________.
  2. 2. When the urinary bladder is full, urine is discharged through the __________.
  3. 5. The endocrine system is made up of a group of __________ that produce hormones.
  4. 6. Neuron projection specialized in transmitting impulses is called a __________.
  5. 7. Connective tissues are made up of a __________ consisting of living cells and a non-living substance.
  6. 8. The biggest artery is __________.