Question

nich of the following statements correctly matches a membrane protein with its function. Structural proteins bind to molecules to facilitate entry to or exit from the cell. Carrier proteins form water-filled channels that allow molecules to pass through. Channel proteins are classified as uniport, symport, or antiport carriers. Receptors transmit signals from the extracellular environment to the cytoplasm of the cell.

Which of the following statements correctly matches a membrane protein with its function.

-Structural proteins bind to molecules to facilitate entry to or exit from the cell.

-Carrier proteins form water-filled channels that allow molecules to pass through.

-Channel proteins are classified as uniport, symport, or antiport carriers.

-Receptors transmit signals from the extracellular environment to the cytoplasm of the cell.

During the cephalic phase of gastric secretion,

-there is an increased flow of action potentials along the vagus nerve to the stomach.

-the intestine reflexively inhibits gastric emptying.

-the stomach responds to distention.

-secretin inhibits parietal and chief cells.

-production of gastric juice slows down.

Pancreatic cells secrete _____________.

-mucus

-HCl

-enzymes

-more than one of these

-HCO3-

Answer 1

1. carrier proteins forms water filled membrane channels that molecules pass through

-these are called aquaporins and are integral membrane proteins that forms pores in membrane of cells and facilitates transport of water between cells.

2. incraesed flow of action potential along vagus nerve to stomach

-during this phase the thought or smell of food results in the stimulation.

3. Pancreatic cells secrete - more than one of these

- HCO3- and enzymes. Enzymes are secreted and synthesized from exocrine acinar cells and HCO3- from epithelial cells lining pancreatic ducts.