Best Answer: Using single quotation marks around a word or phrase instead of double quotation marks is the standard way of indicating a quotation in British English. In normal, modern British English one uses single quotation marks, with double quotation marks reserved for a quotation within a quotation.
tubular secretion. the passage of substances from the blood in the peritubular capillaries to the tubular filtrate. Functions of tubular secretion. elimation of waste products not filtered by the glomerulus and regulation of the acid-base balance in the body through the secretion of hydrogen ions. what happens to the protein bound substances entering the peritubilar capillaries.
1 For the ongoing synthesis and secretion of human milk, the mammary gland must receive hormonal signals. 2  These signals, which are in direct response to stimulation of the nipple and areola (mammae), are then relayed to the central nervous system. 3  This cyclical process of milk synthesis and secretion is termed lactation.