1. The blood flow through the lungs is about 50% of blood flow through the body.

2. A child has blood type O. The mother is blood type O. The husband is blood type AB. Thus, the husband of the mother could not be the father of the child.

3. The AV nodal delay allows time for the atria to finish contracting before the ventricles begin.

4. A large change in venous blood content has little effect on cardiac output.

5. The major control over blood pressure resistance is the radius of arterioles.

6. A cardiac muscle cell has a prolonged action potential due mainly to an increase in Na permeability.

7. In the body, there is a direct and close proportionality between the hematocrit and blood viscosity.

8. Osmotic pressure is created by the presence in a fluid of small diffusible molecules that easily move through the capillary membrane.

9. A characteristic common to granulocytes and macrophages is that they both produce antibodies

10. In congestive heart failure, the main problem occurs because of blood damming up behind the weak side of the heart.

11. Baroreceptors and chemoreceptors act through spinal cord centers.

12. The thick-walled arteries close to the heart are called muscular arteries.

a. A heart block
b. inactive SA node
c. ventricular hypertrophy
d. two of the above
e. all of the above

a. 8.4
b. 7.8
c. 7.4
d. 4.7
e. none of the above

a. right atrium.
b. left atrium.
c. right ventricle.
d. left ventricle.
e. none of the above

a. formation of binding molecules such as selectins and integrins
b. the WBC begins to roll along a venule
c. the WBC lyses red blood cells
d. two of the above
e. none of the above

a. activity of skeletal muscles.
b. pressure changes in the thorax.
c. urinary output.
d. venous valves.
e. none of the above aid venous return

a. lymphatic vessels.
b. arteries.
c. veins.
d. arterioles.
e. none of the above