(For more, see the What is being tested? section.) A hemoglobin test may be used to: Screen for, diagnose, and measure the severity of anemia (low RBCs, hemoglobin and hematocrit) or polycythemia (high RBCs, hemoglobin and hematocrit) Monitor the response to treatment of anemia or polycythemia.
Calcium channel blockers prevent calcium from entering into the heart muscle cells, and into the smooth muscle cells that cause blood vessels to constrict. This relaxing effect results in the dilation of blood vessels, and a reduced force of contraction of the heart muscle.
Ion channel - Ion channel blockers. 1  A variety of inorganic and organic molecules can modulate ion channel activity and conductance. 2  Tetrodotoxin (TTX), used by puffer fish and some types of newts for defense. 3  Saxitoxin is produced by a dinoflagellate also known as red tide. 4  Conotoxin is used by cone snails to hunt prey.