Melatonin is secreted by the ____ to regulate the sleep/wake cycle.
Fill in the blank(s) with the appropriate word(s).
pineal gland
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Which of the following hormones is important in the regulation of sodium ion concentrations in the extracellular fluid?
A) antidiuretic hormone B) erythropoietin C) aldosterone D) renin
The form of circulatory shock known as hypovolemic shock is ________
A) shock that results from large-scale loss of blood volume, or after severe vomiting or diarrhea B) always fatal C) the form of shock caused by anaphylaxis D) any condition in which blood vessels are inadequately filled and blood cannot circulate normally
Which of the following statements is not true of the precapillary sphincters?
A) They decrease the osmotic pressure in the thoroughfare channel. B) They increase or decrease rates of perfusion to the tissues served by the true capillaries. C) They allow blood to bypass the true capillaries that are fed by the metarteriole. D) They regulate the flow of blood to tissues served by the true capillaries.
The esophagus penetrates the diaphragm through the ____________ ___________ and food then travels to the stomach
Fill in the blank(s) with the appropriate word(s).