Which of the cell types shown determine capillary permeability?

The correct answer to this is:

“Astrocytes”

Astrocytes also called star cells due to their shape are the most abundant glial cells in the brain. Extensions from these cells encase capillaries and offer extra control over which materials enter or leave the intercellular fluid of the CNS thus acting like a permeability membrane.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.