Flame cells and excretory tubbles
C. Solids.
Because for what i know, particles of a solid are hard to separate as there are strong intermolecular forces holding them together
Atrial natriuretic peptide released by certain atrial cells
in response to rising BP or volume, causes systemic vasodilation and inhibits
renin, aldosterone, and ADH release. Hence, it enhances Na+ and water
excretion, reducing BP and bv. Falling
arterial pressure promotes vasoconstriction and conserves Na+ and water.