Erythropoietin is a hormone secreted by the _______ in response to low oxygen levels in the blood.
Fill in the blank(s) with the appropriate word(s)
Answer: kidneys
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Many anaerobic Gram-negative bacteria are normally found in the duodenum.
Answer the following statement true (T) or false (F)
In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.
Four of the five choices listed below are related by a
similar function. Select the exception. a. intercostal muscles b. pleural sac c. atmospheric pressure d. diaphragm e. carotid bodies
Nonpolar molecules are water soluble.
Answer the following statement true (T) or false (F)