which of these are true 1. the force blood places on a vessel is called perfusion. Arteries have pulsatile blood flow, while veins do not.

which of these are true 1. the force blood places on a vessel is called perfusion. 2. Arteries have pulsatile blood flow, while veins do not. 3. The greater the vessel radius at any given time, the greater is its resistance. 4. Blood pressure is determined by blood volume, cardiac output, and resistance. A 1&3 B. 2&4 C. 1,2,3 D. 4 only E. all of the above