Which major organ system includes the thyroid gland, adrenal glands, pituitary gland, and pancreas, coordinating body functions by releasing chemical messengers into the bloodstream?
Answer and explanation
Correct answer: B. Endocrine system
- Step 1: The endocrine system is a network of ductless glands that synthesize and secrete hormones directly into surrounding interstitial fluid and blood vessels.
- Step 2: These chemical hormones travel systemically to target tissues with specific receptors, regulating slow, continuous bodily processes like metabolism, growth, fluid balance, and reproduction.
Answer
Endocrine system
Why not the others: 'Nervous system' The nervous system coordinates body actions via fast electrical and neurotransmitter impulses across synapses; 'Exocrine system' Exocrine glands secrete substances through ducts onto epithelial surfaces (like sweat or salivary glands), not into the bloodstream; 'Integumentary system' The integumentary system consists of the skin, hair, and nails, providing external barrier protection.
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