What specific part of the human brain has the most influence on heart rate, sleep, body temperature, and metabolism, and is a large part of the ventral portion of the diencephalon (read as: die-en-SEFF-ah-lon):

W) hypothalamus (read as: hypo-THAL-ah-mus)

X) cerebellum

Y) pituitary

Z) sella turcica (read as: TURR-sik-ah)
W) HYPOTHALAMUS