What type of gland secretes hormones directly into the circulatory system?
  1. Endocrine
  2. Paracrine
  3. Lipophilic
  4. Exocrine
Explanation
Answer - A - Endocrine glands secrete hormones directly into the circulatory system. These glands are ductless. These types of glands exist within the pancreas, pituitary gland, thyroid, parathyroid, adrenal gland, and gonads.
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