Hormones are secreted by:

Question

Hormones are secreted by:

1. A. Sebaceous glands
2. B. Reproductive glands
3. C. Exocrine glands
4. D. Endocrine glands (Correct answer)

Correct Answer

Option D — Endocrine glands

Detailed Solution & Explanation

The correct answer is Endocrine glands.

Key Points

• Hormones are secreted by endocrine glands, which are also called ductless glands because they release their secretions directly into the bloodstream rather than through ducts.
• The blood then carries these chemical messengers to distant target organs, where they regulate growth, metabolism, reproduction and homeostasis.
• The major endocrine glands of the human body are the pituitary (often called the master gland), the thyroid, parathyroid, adrenal, pineal and thymus glands.
• This is in direct contrast to exocrine glands, which secrete through ducts onto a surface or into a cavity — examples include the salivary, sweat and sebaceous (oil) glands.
• Some organs are mixed or heterocrine glands, performing both roles: the pancreas secretes digestive enzymes through a duct (exocrine) and the hormones insulin and glucagon into the blood (endocrine).
• The gonads — testes and ovaries — are likewise mixed.

Exam Tip

• the endocrine/exocrine/mixed classification is the core concept tested here.

प्रश्न (हिन्दी में)

हार्मोन किसके द्वारा स्रावित होते है?

1. A. तैलीय ग्रंथियां
2. B. प्रजनन ग्रंथियां
3. C. बहि:स्रावी ग्रंथियां
4. D. अंत:स्रावी ग्रंथियां