BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Endocrine glands secrete hormones straight into the bloodstream. Hormones help to control many body functions, such as growth, repair and reproduction. The endocrine system involves many organ systems and hormones, many of which are still being investigated and understood.

Detailed explanation-2: -Endocrine glands are ductless glands and release the substances that they make (hormones) directly into the bloodstream.

Detailed explanation-3: -Endocrine glands are ductless glands of the endocrine system that secrete their products, hormones, directly into the blood. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.

Detailed explanation-4: -Endocrine glands are also known as the ductless glands because of the fact that their secretions are released directly into the blood, not to any tubes or ducts.

Detailed explanation-5: -So, the correct answer is ‘Endocrine glands’.