Which of the following statements regarding ureters is correct?

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: Chest cavity compresses the lungs - This is incorrect; during inspiration, the chest cavity expands, not compresses.

b: Length of the thoracic cavity decreases - This is incorrect; during inspiration, the thoracic cavity increases in length as it expands.

c. Diameter of the thoracic cavity increases. When inspiratory muscles contract, such as the diaphragm and external intercostal muscles, the thoracic cavity expands, increasing its volume. This expansion decreases the pressure within the lungs, causing air to flow in (inspiration).

d: Diaphragm rises up in the abdomen - This is incorrect; during inspiration, the diaphragm contracts and moves downward, not upward.