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CAMPBELL BIOLOGY IN FOCUS
Urry • Cain • Wasserman • Minorsky • Jackson • Reece
32
Homeostasis and
Endocrine Signaling
Lecture Presentations by
Kathleen Fitzpatrick and Nicole Tunbridge
© 2014 Pearson Education, Inc.
Figure 32.1
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Figure 32.2
Lumen
10 m
Apical surface
Nervous tissue
Epithelial
tissue
Epithelial
tissue
(Confocal LM)
Basal surface
Axons of
neurons
Blood
vessel
Glia
20 m
Blood
Plasma
White
blood cells
50 m
Loose
connective
tissue
Skeletal muscle tissue
Nuclei
Red blood cells
Muscle
cell
100 m
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Collagenous
fiber
Elastic fiber 100 m
Figure 32.5a
(a) A walrus, an endotherm
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Figure 32.5b
(b) A lizard, an ectotherm
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Major control systems
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Figure 32.9
(a) Signaling by hormones (b) Signaling by neurons
Stimulus
Stimulus
Endocrine
cell
Cell
body of
neuron
Nerve
impulse
Hormone
Axon
Signal
travels to
a specific
location.
Signal
travels
everywhere.
Blood
vessel
Nerve
impulse
Axons
Response
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Response
Figure 32.11a
Major Endocrine Glands
and Their Hormones
Pineal gland
Melatonin
Thyroid gland
Thyroid hormone
(T3 and T4)
Calcitonin
Parathyroid glands
Parathyroid hormone (PTH)
Ovaries (in females)
Estrogens
Progestins
Testes
(in males)
Androgens
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Hypothalamus
Pituitary gland
Anterior pituitary
Posterior pituitary
Oxytocin
Vasopressin
(antidiuretic
hormone, ADH)
Adrenal glands
(atop kidneys)
Adrenal medulla
Epinephrine and
norepinephrine
Adrenal cortex
Glucocorticoids
Mineralocorticoids
Pancreas
Insulin
Glucagon
Figure 32.11b
Neurosecretory
cells of the
hypothalamus
Hypothalamus
Portal vessels
Hypothalamic
hormones
HORMONE
Posterior
pituitary
Anterior pituitary
Endocrine cells
TARGET
Pituitary hormones
FSH
TSH
ACTH
Prolactin
MSH
GH
Testes or
ovaries
Thyroid
gland
Adrenal
cortex
Mammary
glands
Melanocytes
Liver, bones,
other tissues
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Figure 32.11c
Stimulus
TSH circulation
throughout body
Sensory
neuron
Negative feedback
−
Hypothalamus
Thyroid
gland
Neurosecretory cell
TRH
Thyroid
hormone
Thyroid hormone
circulation
throughout
body
−
TSH
Anterior
pituitary
Response
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Pathways of Water-Soluble and Lipid-Soluble
Hormones
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Figure 32.13
Same receptors but different
intracellular proteins (not shown)
Different cellular responses
Different receptors
Different cellular responses
Epinephrine
Epinephrine
Epinephrine
 receptor
 receptor
 receptor
Glycogen
deposits
Glycogen
breaks down
and glucose
is released
from cell.
(a) Liver cell
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Vessel
dilates.
(b) Skeletal muscle
blood vessel
Vessel
constricts.
(c) Intestinal blood
vessel
Figure 32.14
Tadpole
Adult frog
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