Chapter 20, Problem 17RQ

How does vasoconstriction help increase the core temperature of the body?

State the main functions of venules and veins. What forces work together in returning venous blood to the heart?

Cocaine use causes vasoconstriction. Is this likely to increase or decrease blood pressure, and why?

What arteries play the leading roles in supplying blood to the brain?

The contraction phase of the heartbeat is ______; the relaxation phase is _______.

Why is the plateau phase so critical to cardiac muscle function?

A blood vessel with a few smooth muscle fibers and connective tissue, and only a very thin tunica extenia conducts blood toward the heart. What type of vessel is this?

The heart's internal pacemaker beats by: an internal implant that sends an electrical impulse through the heart the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node the action of the sinus

The cardiovascular centers are located in which area of the brain? medulla oblongata pons mesencephalon (midbrain) cerebrum