Three major classes of animal-cell junctions: 

1. Anchoring junctions

2. Tight junctions

3. Gap junctions

TLS Online TPP Program

#Id: 1195

#Unit 7. System Physiology – Animal

Female hormonal system, consists of three hierarchies of hormones:

1. GnRH

2. FSH and LH

3. Estrogen and progesterone

TLS Online TPP Program

#Id: 1196

#Unit 7. System Physiology – Animal

FSH and LH stimulate sex hormone synthesis by the activation of the cyclic adenosine monophosphate second messenger system.

TLS Online TPP Program

#Id: 1197

#Unit 7. System Physiology – Animal

Granulosa cells have FSH receptors Theca cells have LH receptors

TLS Online TPP Program

#Id: 1198

#Unit 7. System Physiology – Animal

FSH stimulates aromatase in the granulosa cells

TLS Online TPP Program

#Id: 1199

#Unit 7. System Physiology – Animal

LH stimulates cholesterol desmolase in the theca cells

TLS Online TPP Program

#Id: 1200

#Unit 7. System Physiology – Animal

In the granulosa cells,

All the androgens and much of the progesterone are converted into estrogens by the enzyme aromatase