A nurse practitioner is teaching a student NP about the physiologic basis for damage to the circulatory and neurological systems that can accompany hypotension. Which of the following responses by the student would warrant correction by the nurse practitioner?
"As vessel wall thickness increases, tension decreases."
"Smaller blood vessels require more pressure to overcome wall tension."
"The smaller the vessel radius, the greater the pressure needed to keep it open."
"Tension and vessel thickness increase proportionately."