Exam 30: Circulation of the Blood

Which of the following is not a mechanism that increases blood volume and therefore venous return of blood to the heart?

As arterial blood pressure decreases, the number of impulses from the carotid baroreceptors to the medulla decreases.

The Fick law of the heart says that, within limits, the longer the heart fibers are at the beginning of a contraction, the stronger the contraction will be.

The "pump" of the "respiratory pump" that moves blood to the central veins is the diaphragm.

ANH and ADH work synergistically to increase total blood volume.

The drop in blood pressure is greater between the aorta and capillary bed than it is between the capillaries and the venae cavae.

Which of the following is not part of the vasomotor control mechanism?

Parasympathetic control of the heart depends on the glossopharyngeal nerve (cranial nerve IX).

Venous pulse is just as significant clinically as arterial pulse.

Name and explain the vasomotor reflexes.

If fluid were collecting at the venous end of a capillary, it could be caused by either a drop in hydrostatic pressure or an increase in osmotic pressure.

Emotional stress can influence heart rate by creating impulses that go from the cerebrum to the cardiac centers via the hypothalamus.

Name and explain the reflexes that affect heart rate.