Which of the following would be a function of the cells of sertoli (nurse cells)
a. secretion of inhibin
b. these cells secrete the androgen binding protein
c. divide by meiosis to provide a constant source of spermatogonia
d. provides nourishment for developing sperm
e. these cells from the blood-testes barrier

All are the function of sertoli cells except option c.

Explanation:

Please note the correct question should be "Which of the following would "not" be a function of the cells of Sertoli".

Sertoli cells, also termed as nurse cells, are somatic cells present in seminiferous tubule.

These cells play important role in the process of spermatogenesis, that is, production of sperm and formation of testes.

They also form hemato-testes barrier or blood-testes barrier or sertoli cell barrier.

They release various types of proteins such as inhibin, androgen-binding protein, and antimullerian hormone.

Sertoli cells being somatic in nature divide by mitotic division and not by meiotic division.

Germ cells, not sertolic cells, provide constant supply of spermatogonia.

Thus, option c is not a function of sertoli cells

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!