Answer:
B.With pillow between the legs.
Answer:
c. facilitated diffusion requires an integral protein
Explanation:
Facilitated diffusion is process of the spontaneous passive transport (high to low concentration) of molecules or the ions across biological membrane by using specific trans-membrane proteins.
Facilitated transport does not require chemical energy from the ATP hydrolysis as it is a passive transport.
On the other hand, simple diffusion is the transport of the molecule from high tot low concentration without the use of a specific molecule.
Option A, B, D and E are incorrect.
Answer:
The correct answer is e. all of the above.
Explanation:
Nurse cells are also called sertoli cells and are located in the seminiferous tubules in the testes. They provide nourishment to the growing sperms by providing nutrients from surrounding cells.
During the development of of sperms they become genetically different from other cells so nurse cells form blood testes barrier to protect them from immune cells.
Nurse cells concentrate the testosterone in seminiferous tubules which is necessary for proper development of sperms. They also secrete inhibin which stop FSH secretion from anterior pituitary therefore regulate the spermatogenesis.
