Sexual behavior in animals is largely controlled by estrogen levels in the female and the occurrence of estrus in the male. T or F?
Sexual behavior in animals is largely controlled by estrogen levels in the female and the occurrence of estrus in the male. T or F?
Endocrine glands lack ducts and are hence, called ductless glands. Their secretions are called hormones. Hormones are non-nutrient chemicals that act as intercellular messengers and are produced in trace amounts. A large number of chemicals act as hormones and provide coordination in the vertebrates.
The endocrine glands and hormone-producing diffused cells located in different parts of our body constitute the endocrine system. The pituitary, pineal, thyroid, adrenal, pancreas, parathyroid, thymus, and gonads are organized endocrine bodies in our bodies. Some other organs like the gastrointestinal tract, liver, kidney, the heart also produce hormones.
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