Define the following:
(a) Exocrine gland
(b) Endocrine gland
(a) Exocrine glands: Glands that
discharge secretions into ducts are known as exocrine glands.
Sebaceous gland in the skin, salivary gland in the buccal cavity,
etc. are examples of exocrine glands.
(b) Endocrine glands: Glands that do
not discharge their secretions into ducts are known as endocrine
glands. Instead, these glands discharge their secretions directly
into the blood. Pituitary gland, thyroid gland, adrenal gland,
etc. are examples of endocrine glands.
(c) Hormones: Hormones are chemical
messengers that regulate physiological processes in living
organisms. They act upon specific cells/tissues/organs which are
called target cells/tissues/organs.
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