Which of the choices below are the most important hormone regulators of electrolyte reabsorption and secretion?
A) angiotensin II and ADH
B) angiotensin II and aldosterone
C) angiotensin I and epinephrine
D) angiotensin I and atrial natriuretic peptide
B) angiotensin II and aldosterone
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Under quiet conditions, blood returning to the heart retains about ________ of its oxygen content
A) 25 percent B) 50 percent C) 75 percent D) 90 percent E) 100 percent
Physiology examines the mechanisms of actions. in the body
a. True b. False Indicate whether the statement is true or false
Which structure collects venous blood and cerebrospinal fluid?
A) Cerebral aqueduct B) Fourth ventricle C) Superior sagittal sinus D) Arachnoid villus
Which of the following is NOT typically true about G proteins?
A. They can be inhibitory for second-messenger production. B. They can be stimulatory for second-messenger production. C. They act as second messengers. D. They can act as transducers for activated receptors by opening or closing ion channels.