Page 32 - Color Atlas Physiology

C. Gap junction

Cell 1
COO – Channel
(1.2–1.5 nm)
+
NH 3 Cytosol 1
Cell 2

Cell membranes Transport In, Through and Between Cells II

Cytosol 2

1 Ions, ATP, cAMP,
amino acids, etc.
Connexon of Cell 1 3
2
Connexin Plate 1.9
Connexon of Cell 2
(27kDa)
Channel open Channel closed

D. Apical functional complex
1 Apical Microvilli

Tight Para-
junction cellular
transport
See (2)
Cell 2 Actin-
Zonula myosin
belt
adherens Cell 1
Epithelial cells (e.g., enterocytes) Basolateral N
N
Occlusin

E-cadherin
Myosin II
Actin Adapter proteins
Ca 2+
2
19
19
Photos: H. Lodish. Reproduced with permission from Scientific American Books, New York, 1995.
Despopoulos, Color Atlas of Physiology © 2003 Thieme
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