Sperm cells are motile germ cells.
They have a streamlined shape, consist of a head, neck and a long flagellum (tail).
The cell contains a small amount of cytoplasm, a large nucleus. At the anterior end of the head is an acrosome, a modified Golgi apparatus containing hydrolytic enzymes used to dissolve the egg membrane during fertilization.
The energy for movement of the flagellum is provided by mitochondria located in its initial section.
Unlike sperm, the eggs are large in size, have a spherical shape, are not capable of independent movement, have a significantly larger cytoplasm and nutrient supply, and are coated with protective membranes.
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