ch 5 bio quiz

systolic pressure, ejection of blood from the heart
Normal blood pressure is 120/80. What is the top number called and what is happening in the heart?

When arterioles dilate blood pressure falls because of the increase in the cross-sectional area of the vessels.
Elizabeth takes a prescription drug that dilates her arterioles. What does this do to her blood pressure? Why?

radial artery
Which of the following could be used to take a pulse?