Action potentials received directly from stimulate the papillary muscles to contract allowing for the proper of the av valves.

Which best describes a benefit of using dna technology in medicine? a) medicine can be produced in mass quantities. b) medicine can be distributed at a reduced cost. c) medicines have fewer side effects. d) medicines are resistant to antibiotics.

Approximately percent of the energy created by cell metabolism is used by the body to carry on its normal functions, such as respiration, digestion, reproduction, muscular movement, circulation, and cellular regrowth.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm