Other questions in this quiz

2. the heart's pacemaker, a patch of tissue that sends out waves of electrical impulses at regular intervals in order to initiate contractions

  • SAN
  • AVN

3. when volume INCREASES, pressure ________

  • decreases
  • increases

4. the large surface area in a fish's exchange surface comes from.....

  • the pairs of gills
  • the highly folded gill filaments (gill lamellae)
  • the many gill filaments

5. arteries have a THICK layer of....

  • elastin
  • smooth muscle
  • collagen

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