Chapter 20, The Circulatory System: Blood vessels and Circulation

How many pulmonary arteries empty into the right atrium of the heart?

A. 0

During exercise, arterioles to the skeletal muscles .

A. Dilate in response to increased muscle metabolites.

Which of the following would decrease the velocity of blood flow?

A. Increased viscosity

Arteries are sometimes called the _______________ vessels of the cardiovascular system because they have strong-resilient tissue structure.

A. Resistance

What is taken up by the capillaries at their venous end?

A. Waste products

Where is the vasomotor center located?

B. Medulla oblongata

What is the most important force in venous flow?

B. The pressure generated by the heart.

The outermost wall of an artery or vein is called the and in large arteries and veins, which contains the .

B. Tunica externa; vasa vasorum

Which of the following has the most important effect on blood velocity?

B. Vessel radius

Which of the following does not move substances across capillary walls?

C. Group transport

Which of the following routes of blood flow is correct?

D. Heart - conducting artery - distributing artery - arteriole - capillary - venule - medium vein - large vein - heart

Which of the following is associated with vasoreflexes?

D. Smooth muscle in the tunica media

Where is the greatest volume of blood found in the body?

D. Veins

What is the most important force driving filtration at the arterial end of a capillary?

E. Blood hydrostatic pressure

Large veins, medium veins, and venules have valves to prevent the backflow of blood.

False

Most tissue fluid is reabsorbed by the lymphatic system

False

The brachial vein is the most common site of blood pressure measurement with the sphygmomanometer.

False