Isovolumetric Ventricular Relaxation

Closure of aortic valve producing the second heart sound (S2).

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#Id: 1197

#Unit 7. System Physiology – Animal

Granulosa cells have FSH receptors Theca cells have LH receptors

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#Id: 1198

#Unit 7. System Physiology – Animal

FSH stimulates aromatase in the granulosa cells

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#Id: 1199

#Unit 7. System Physiology – Animal

LH stimulates cholesterol desmolase in the theca cells

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#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

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#Id: 1201

#Unit 7. System Physiology – Animal

Theca cells synthesize and secrete progesterone.

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#Id: 1202

#Unit 7. System Physiology – Animal

Three estrogens are present in the plasma of the human female:

1. β-estradiol

2. Estrone

3. Estriol