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1 2 3 4 5 6 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Neurotransmitter
Nerve impulse
Neuron
Target cells
(a) Nervous system
Endocrine
cells
Target cells
Hormone in
bloodstream
(b) Endocrine system
7 8 9 10 11 12 13 14 15 16 17 18 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Hydrophilic Receptor in Target
hormone
plasma
cell
membrane
Transport
protein
Secondmessenger
activation
Free
hormones
Bound
hormone
Hydrophobic
hormone
Receptor in
nucleus
Tissue fluid
Blood
19 20 21 22 23 24 25 26 27 28 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Telencephalon of brain
Future hypothalamus
Neurohypophyseal bud
Hypophyseal pouch
Pharynx
Tongue
Future thyroid
gland
Mouth
(a) 4 weeks
Hypothalamus
Hypothalamus
Optic chiasm
Neurohypophyseal
bud
Pituitary stalk
Posterior lobe
Hypophyseal pouch
Anterior lobe
Sphenoid bone
Pharynx
Pharynx
(b) 8 weeks
(c) 16 weeks
29 30 31 
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