Distinguish between hormones and enzymes.

Hormones	Enzymes
These are secreted by endocrine glands.	These are secreted by exocrine glands.
They are transported by blood.	They are transported by ducts.
The hormones are needed in less amount.	The enzymes are needed in more amount.
The hormones may be formed from amino acids, proteins, peptides and steroids.	Enzymes are only proteinous.
Hormones undergo changes during chemical reaction.	Enzymes do not undergo any change.

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Write the name and the source of hormones regulating the following :

(a) Uterine changes in pregnancy.
(b) Urinary elimination of water.
(c) Metamorphosis of tadpoles.
(d) Plasma Ca⁺² level.
(e) Na⁺ and K⁺ metabolism.
(f) Blood sugar level.
(g) Uterine contractions at the time of child's birth.

Chemical Coordination and Integration

Distinguish between hormones and enzymes.