Which of the following is correct for adult dentition?
8 incisors, 4 canines, 6 bicuspids, and 12 molars in total
6 incisors, 4 canines, 6 bicuspids, and 12 molars in total
4 incisors, 4 canines, 2 bicuspids, and 6 molars on each side
4 incisors, 2 canines, 4 bicuspids, and 6 molars on each side
As a result of facilitated diffusion and cotransport mechanisms in the PCT, 99 percent of the glucose, amino acids, and other nutrients are reabsorbed before the filtrate leaves the PCT. A reduction of the solute concentration of the tubular fluid occurs due to active ion reabsorption of sodium, potassium, calcium, magnesium, bicarbonate, phosphate, and sulfate ions. The passive diffusion of urea, chloride ions, and lipid-soluble materials further reduces the solute concentration of the tubular fluid and promotes additional water reabsorption. Organs of the digestive system include the oral cavity, pharynx, esophagus, stomach, small intestine, large intestine, and accessory organs (teeth, tongue, salivary glands, liver, pancreas, and gallbladder). The hormones include the following: enterocrinin, which stimulates the submucosal glands of the duodenum; secretin, which stimulates the pancreas and liver to increase the secretion of water and bicarbonate ions; cholecystokinin (CCK), which causes an increase in the release of pancreatic secretions and bile into the duodenum, inhibits gastric activity, and appears to have CNS effects that reduce the sensation of hunger; gastric inhibitory peptide (GIP), which stimulates insulin release at pancreatic islets and the activity of the duodenal submucosal glands; vasoactive intestinal peptide (VIP), which stimulates the secretion of intestinal glands, dilates regional capillaries, and inhibits acid production in the stomach; gastrin, which is secreted by G cells in the duodenum when they are exposed to large quantities of incompletely digested proteins; and, in small quantities, motilin, which stimulates intestinal contractions; villikinin, which promotes the movement of villi and associated lymph flow; and somatostatin, which inhibits gastric secretion. Air passing through the glottis flow into the larynx and through the trachea. From there, the air flows into a main bronchus, which supplies the lungs. In the lungs, the air passes to lobar bronchi, segmental bronchi, bronchioles, a terminal bronchiole, a respiratory bronchiole, an alveolar duct, an alveolar sac, an alveolus, and ultimately to the blood air barrier.