An individual must hold an Administrative Services Credential to provide the following services in grades preschool, Kâ12 and adults: Evaluate the quality and effectiveness of instructional services at the school site level.
1 Release of water, acids, enzymes, and buffers by the digestive tract and by the accessory organs into the lumen of the digestive tract. 2  Absorption. 3  Movement of small organic molecules, electrolytes, vitamins, and water across the digestive epithelium and into the blood and lymph.astrointestinal (GI) tract (also called alimentary canal or digestive tract). 1  The GI tract is a continuous tube running from the mouth to the anus. 2  It includes the following organs: 3  mouth. 4  pharynx. 5  esophagus. 6  stomach. 7  small intestine. 8  large intestine.
Other pH-Buffer Systems in the Blood. Other buffers perform a more minor role than the carbonic-acid-bicarbonate buffer in regulating the pH of the blood. The phosphate buffer consists of phosphoric acid (H 3 PO 4) in equilibrium with dihydrogen phosphate ion (H 2 PO 4 -) and H + .he pK for the phosphate buffer is 6.8, which allows this buffer to function within its optimal buffering range at physiological pH. The phosphate buffer only plays a minor role in the blood, however, because H 3 PO 4 and H 2 PO 4 - are found in very low concentration in the blood.