Explain the difference between the following terms:
$(1)$ Testosterone - Progesterone
$(2)$ Vasa efferentia - Vas deferens

(N/A) $(1)$ $\Rightarrow$ Testosterone: It is a primary male sex hormone produced by the Leydig cells of the testes. It is responsible for the development of secondary sexual characteristics in males.
$\rightarrow$ Progesterone: It is a female sex hormone produced mainly by the corpus luteum in the ovary. It is essential for maintaining the endometrium of the uterus for implantation of the embryo.
$(2)$ Vasa efferentia: These are a series of fine ciliated ducts that arise from the rete testis and carry spermatozoa from the testis to the epididymis.
$\rightarrow$ Vas deferens: It is a long,muscular tube that arises from the cauda epididymis and transports mature sperm from the epididymis to the ejaculatory duct.