gonad

Examples of gonad in the following topics:

• Pineal Gland and Gonads

  • The pineal gland is responsible for melatonin production, while the gonads secrete hormones relating to sexual characteristic development.
  • The gonads are additional types of endocrine glands .
  • The gonads are the sex organs.
  • Describe the effects of melatonin and gonad produced hormones in the body

• The Evolution of Reproduction

  • Sexually-reproducing organisms have evolved specialized gonads, along with a variety of ways to transfer sperm during reproduction.
  • The evolution of reproductive organs arrived with the development of gonads that produced sperm and eggs .
  • The development of specialized gonads to produce sperm and egg was a major step in the evolutionary process.
  • Vertebrates have similar structures (i.e., gonads that specialize in sex cell production) with a few differences in their reproductive systems.
  • The evolution of sex-specific gonads led to the development of sperm (male) and eggs (female).

• Hormonal Regulation of the Reproductive System

  • Male and female gonads are regulated by FSH and LH from the pituitary; their production is stimulated by GnRH, secreted by the hypothalamus.
  • Regulation of the reproductive system is a process that requires the action of hormones from the pituitary gland, the adrenal cortex, and the gonads.
  • These hormones regulate the gonads (testes in males and ovaries in females); they are called gonadotropins.
  • In both males and females, FSH stimulates gamete production and LH stimulates production of hormones by the gonads.
  • An increase in gonad hormone levels inhibits GnRH production through a negative feedback loop .

• Class Scyphozoa

  • The gonads are formed from the gastrodermis with gametes expelled through the mouth.

• Infertility

  • Other factors that affect fertility include toxins (such as cadmium), tobacco smoking, marijuana use, gonadal injuries, and aging.

• Steroids

  • Cholesterol is also a precursor to many important steroid hormones like estrogen, testosterone, and progesterone, which are secreted by the gonads and endocrine glands.

• Phylum Annelida

  • Annelids may be either monoecious, with permanent gonads (as in earthworms and leeches), or dioecious, with temporary or seasonal gonads that develop (as in polychaetes).

• Phylum Echinodermata

  • Gonads are present in each arm.
  • Gonad 10.

• Male Reproductive Anatomy

  • The reproductive tissues of male and female humans develop similarly in utero until a low level of the hormone testosterone is released from male gonads.
  • Primitive gonads become testes; other tissues produce a penis and scrotum in males.

• Class Cubozoa and Class Hydrozoa

  • The true characteristic shared by all these diverse species is that their gonads for sexual reproduction are derived from epidermal tissue, whereas in all other cnidarians they are derived from gastrodermal tissue.