REPRODUCTION Human Reproductive Systems

Human Reproduction and Development

Takes place internally

Depends on the endocrine system (hormones), nervous system, and reproductive system.

Human Reproduction and Development

Gonads are sex organs that produce gametes (egg and sperm).

That’s right, I said gonads!!

Human Reproduction and Development

Male gonads are the testes, which produce sperm and male sex hormones.

Human Reproduction and Development

Female gonads are the ovaries, which produce eggs (ova) and female sex hormones.

The Male Reproductive System

Testes are outside the body cavity Why? What could be the benefit that out

weighs the potential harm?

The Male Reproductive System Sperm is produced at approximately

93°F Body Temperature is approximately

98.6°F

Inside the testes

1. Seminiferous tubules: sperm produced by meiosis. Spermatocytes: cells that divide by meiosis to

produce spermatids Spermatids mature into sperm

Seminiferous Tubules - extend over 1700 ft

Spermatogenesis

Begins at puberty Approx. 200,000,000

sperm produced each day!

Sperm stored in the Epididymis to mature.

Gametogenesis

Sperm Production in Testis

Testis

Sexual Structures

Vas Deferens – carries sperm from epididymis to urethra

Urethra – carries sperm to outside the body Seminal vesicles - add fructose and nutrients

to sperm as they pass. Prostate gland - secretes a milky alkaline fluid. Sperm and secretions make up semen.

Male Sex Hormones

Follicle-stimulating Hormone (FSH) Promotes sperm maturation

Luteinizing Hormone (LH) Stimulates cells to secrete testosterone

Testosterone Sperm formation Secondary sex characteristics