Hemoglobin that is 100% saturated carries- 100 mm Hg oxygen pressure
O four oxygen molecules per hemoglobin molecule
O four carbon dioxide molecules per hemoglobin molecule
O 100% of the oxygen in the blood stream

It is 100% of the oxygen in the blood stream

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endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d