Which of the following layers of epidermis contains the rapidly dividing keratinocytes?

a: Receptor - Receptors are proteins that bind to signaling molecules (ligands) outside the cell and initiate cellular responses but do not typically facilitate ion movement.

b. Channel-Integral membrane proteins called ion channels create pores in the cell membrane, allowing specific ions to pass through, thus facilitating ion movement into or out of the cell.

c: Ligand - Ligands are signaling molecules that bind to receptors, activating them, but they do not facilitate ion movement.

d: Peripheral - Peripheral proteins are found on the surface of the cell membrane but are not typically involved in creating ion channels

a. Pyloric sphincter: This sphincter regulates the passage of chyme from the stomach into the duodenum.

b. Lower esophageal sphincter: This sphincter prevents the backflow of stomach contents into the esophagus.

c. Ileocecal sphincter: This controls the flow of material from the ileum of the small intestine into the cecum of the large intestine.

d. Internal anal sphincter: This sphincter controls the release of feces from the rectum but is not involved in the release of chyme