The hypothalamus controls secretion in the adenohypophysis by
A) direct neural stimulation.
B) indirect osmotic control.
C) secreting releasing and inhibiting hormones into the hypophysealportal system.
D) altering ion concentrations and pH in the anterior pituitary.
E) gap synaptic junctions.
C
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Which of the following is considered a primary lymphoid organ?
A) appendix B) thymus C) tonsils D) spleen
Describe platelets and their origin
A) Platelets are derived by lymphoid stem cells that divide into lymphocytes and in the process shed some cytoplasmic fragments. B) Platelets are the remnants of the reticulocyte organelles during the maturation of a reticulocyte into a red blood cell. C) Platelets are precursor cells to the myeloid and lymphoid stem cells. D) Platelets are immature red blood cells. E) Platelets are cell fragments that develop from megakaryocytes.
A sound with a frequency of 12,000 hertz would be
A) very loud. B) barely audible. C) high-pitched. D) low-pitched. E) barely audible and low-pitched.