Cells grown in the laboratory are mixed with a dye molecule that is unable to pass through the plasma membrane. if a ligand is added to the cells, observations show that the dye enters the cells. what type of receptor did the ligand bind to on the cell surface?

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.