Assertion: reproductive system's part | /r/HasProperty | the head
Facets:
Source sentences:
text: The sperm is a microscopic cell that is made up of four parts: the head, the neck, the middle piece, and the tail.
text: Sperm have three parts: a head, which holds the chromatin, a midpiece filled with mitochondria to provide energy, and a flagellum or tail to move the sperm from the vagina to the oocyte.
text: The three parts are the head, body, and tail.
text: Each epididymis is comprised of three parts: the head, body, and tail.