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Hormones
Chapter 17
We have seen nerve impulse travel through neurons, how
hormones travel…….
The Endocrine Glands
Hence they are the Chemical Messengers
Why the action of hormones is specific to some target cells only?
Your hormones travel freely in blood?
Is fat intake important in terms of hormones….
• Hormones
– Peptide/Protein e.g., GH
– Lipid based e.g., Testosterone, Estrogen
– Amines (Tyrosine/Tryptophan) e.g., Epinephrine
Chemical classification of hormones
Do all hormones enter the cell?
........ soluble hormones trigger responses
without entering the cell.
…… soluble hormones trigger responses
after entering the cell.
Mechanism of Action
Hypothalamus
Pituitary
gland
Testes
(in males)
Ovaries
(in females)
Pancreas
Adrenal glands
Thyroid gland
Glands we shall study…
• Hypothalamus and Pituitary
• Adrenal Glands
• Thyroid
• Pancreas
Brain
Hypothalamus
Posterior pituitary
Anterior pituitary
Bone
Anterior and Posterior Pituitary
Name a gland that can produce multiple hormones…..
1. Name the hormone…..
How does it act?
An overactive thyroid
(hyperthyroidism) can cause a
person to feel too hot, while an
underactive thyroid (hypothyroidism)
can cause a person to feel too cold.
Negative Feedback
Life is
Homeostasis