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.
This is a simple tubular gland. In this type of gland, the lumen is straight (unbranched). This is a simple acinar gland. In this type of gland, the secretory units are rounded - and the secretory portion looks rounded. This is a simple branched tubular gland. Several secretory portions converge onto a single unbranched duct of wider diameter. This is a compound branched tubular gland. In compound glands, the ducts are branched.