Resistance to blood flow depends mainly on

Resistance to blood flow depends mainly on
  a. the diastolic pressure.
  b. elastic tissue of the vessels.
  c. blood vessel diameter.
  d. valves in the vessels.
  e. ultrafiltration pressure in the capillaries.

Question 2

Cardiac muscle cells
  a. do not contract by a sliding filament mechanism.
  b. are similar to those of smooth muscle in being
  nonstriated.
  c. have fewer mitochondria than skeletal muscle
  cells do.
  d. possess numerous gap junctions on their sides,
  favoring rapid spread of excitation.
  e. have intercalated disks with tight junctions at
  their branching ends.