Endocrine gland | Exocrine gland |
These glands do not discharge their secretions through glands. Their secretions directly reach the bloodstream. They are also known as ductless glands. Their secretions are hormones. Example: thyroid gland, pituitary gland, adrenal gland, pineal gland, etc. | Exocrine glands discharge their secretions through ducts. Their secretions reach body surface and are mostly composed of enzymes and salts. Examples are sebaceous glands, lacrimal gland, salivary gland, etc. |