Which of the following statements concerning regulation of blood flow is TRUE?
A. In the systemic circuit, increased levels of metabolic waste products and decreased oxygen concentration in tissues promote hyperemia through the tissues.
B. If blood flow to a tissue is blocked for a period of time and then the block is removed, the result is a reactive hyperemia in which blood flow through the affected tissue remains low.
C. According to flow autoregulation, if blood pressure to an arteriole is decreased, blood flow will not return toward its original level until the original blood pressure is restored.
D. In the systemic circuit, high levels of CO2 and metabolites tend to cause contraction in the smooth muscle of arteriole walls.
E. The resistance to blood flow in brain and heart vascular beds does not vary in response to changes in local gas or metabolite concentrations.
A
You might also like to view...
Muscles and glands that respond to nervous stimulation are called ________.
Fill in the blank(s) with the appropriate word(s).
The reflex movement of the head toward a loud noise is directed by the mesencephalon. Which nuclei accomplish this?
A) substantia nigra B) red nuclei C) tectum D) superior colliculi E) inferior colliculi
____________________ is a pathophysiological condition in which nerve cells lose their myelin sheath
Fill in the blank(s) with correct word
Answer the following questions true (T) or false (F)
1. Ejaculation is accomplished by the parasympathetic nervous system. 2. Most organs experience dual innervation from the sympathetic and parasympathetic nervous systems. 3. The reticular formation can exercise control over autonomic centers if its connection with the hypothalamus is severed.