Erythropoietin (EPO) was first isolated from the urine of anemic patients who had high circulating levels of the hormone. Despite the presence of the hormone that stimulates red cell production, however, these patients were unable to produce adequate amounts of hemoglobin or red cells. Give some possible reasons that the patients' own EPO was unable to correct their anemia.
What will be an ideal response?
Some other factor that is essential for red blood cell synthesis must be lacking. These would include iron for hemoglobin production, folic acid, and vitamin B12.
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An individual's hematocrit would vary with
A. age. B. sex. C. altitude. D. All of the choices are correct.
Hormones
a. are all of similar chemical composition. b. combine with specific receptors on the target cell's surface or inside the target cell. c. are secreted at a constant rate. d. are also known as paracrines e. all of these answers.
The middle layer of the eye with a dark pigment to absorb stray light is the
(a) Retina (b) Choroid (c) Cornea (d) Sclera
Which fluids are buffered by the phosphate buffer system?
A) ECF, blood plasma B) ICF, blood plasma C) ICF, ECF, blood plasma D) ECF, urine E) ICF, urine