What is the male gamete produced in the testes called?

The male gamete produced in the testes is called a sperm cell. In the process of reproduction, male gametes are essential for fertilization, as they combine with female gametes, or ova, produced in the ovaries. Sperm cells are specifically designed to travel and reach the egg, which is critical for successful reproduction. They contain genetic material that will contribute to the genetic makeup of the offspring. In the context of human reproduction and biology, understanding the role and function of sperm is vital for grasping the fundamentals of sexual reproduction and genetic inheritance.

Other choices are not applicable in this context; for example, ova and egg cells refer to female gametes, and an embryo is the developmental stage that follows the fertilization of an egg by a sperm cell.