Age-specific fertility and survivorship data help determine net reproductive rate (R₀).

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#Id: 6583

#Unit 7. System Physiology – Animal

During adolescence, Spermatogonia, mature into primary spermatocytes 

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#Id: 6584

#Unit 7. System Physiology – Animal

TLS Online TPP Program

#Id: 6585

#Unit 7. System Physiology – Animal

The membranes of late spermatids and spermatozoa contain a special small form of angiotensin converting enzyme called germinal angiotensin converting enzyme (gACE)

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#Id: 6586

#Unit 7. System Physiology – Animal

Hormonal factors that stimulate spermatogenesis:

Testosterone

Luteinizing hormone

Follicle-stimulating hormone

Estrogens

Growth hormone

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#Id: 6587

#Unit 7. System Physiology – Animal

Testosterone, secreted by the Leydig cells located in the interstitium of the testis, is essential for growth and division of the testicular germinal cells.

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#Id: 6588

#Unit 7. System Physiology – Animal

Luteinizing hormone, secreted by the anterior pituitary gland, stimulates the Leydig cells to secrete testosterone