Multiple choice

Endocrine glands are those, which secrete their fluids

  1. into blood through ECF

  2. into definite ducts

  3. into blood or ducts

  4. only when they rupture
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A Correct answer
Explanation

Endocrine glands are ductless glands that secrete hormones directly into the bloodstream through extracellular fluid (ECF). This contrasts with exocrine glands, which secrete into ducts (e.g., sweat glands, salivary glands). The key distinction is that endocrine secretions enter blood circulation, not ducts.

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