A solution of picroindigo carmine is used to visualize these cells on a “Christmas tree” stain. (-5[1])Swellings called hydroceles (“hydro-seals”) and hematoceles (“hemato-seals”) can interfere with the storage of these cells, which are found in a pouch (10[1])of serous membrane called the tunica vaginalis. These cells initiate membrane fusion (-5[1])upon binding to (emphasize) (10[1])another class of cells’ ZP3 (10[1])receptors. An influx of calcium ions into these (10[1]-5[1])cells through the CatSper channel (-5[1])initiates (10[1]-5[4])capacitation. The anterior (-5[1])side of these cells contains an acidic vacuole called (10[1])the (10[1])acrosome that (10[6])secretes (10[2])hydrolytic (10[2])enzymes to (10[1])break down a different cell’s (10[1])zona (10[1])pellucida (10[1])(“pel-LOO-sid-uh”). These haploid cells develop in the (10[1])seminiferous (10[1])tubules and are stored in (10[1])the (-5[1])epididymis (“epi-DID-uh-miss”) before traveling through the (10[1]-5[1])fallopian (10[2]-5[3])tubes. For 10 points, name these male (10[1])gametes that fertilize (10[3])eggs. (10[10])■END■