In the context of the endocrine system, which statement correctly describes the primary difference between endocrine and exocrine glands?

• A. Endocrine glands primarily produce enzymes for digestion, whereas exocrine glands primarily regulate long-term homeostasis via hormones.
• B. Endocrine glands secrete hormones into the bloodstream or interstitial fluid, whereas exocrine glands secrete their products through ducts to an epithelial surface or lumen.
• C. Endocrine glands secrete their products through ducts to the skin surface, whereas exocrine glands release hormones directly into the blood.
• D. Endocrine glands are found only in the brain, whereas exocrine glands are found only in the gastrointestinal tract.

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the definitions of endocrine and exocrine glands. Endocrine glands are ductless glands that release their secretions directly into the bloodstream or interstitial fluid, allowing hormones to travel to target organs.
2. Step 2: Recognize that exocrine glands have ducts and secrete their products onto epithelial surfaces or into body cavities, such as the skin surface or the lumen of the gastrointestinal tract.
3. Step 3: Identify the primary function of endocrine glands, which is to regulate physiological processes by releasing hormones that act on distant target cells.
4. Step 4: Identify the primary function of exocrine glands, which is to produce substances like enzymes, sweat, or mucus that act locally at the site of secretion.
5. Step 5: Compare the secretion pathways: endocrine glands secrete hormones into the bloodstream or interstitial fluid without ducts, while exocrine glands secrete their products through ducts to specific surfaces or cavities.