Bio Ch 11

• Occurs between adjacent cells
• Cytoplasmic connections
• -Gap junctions of animal cells
• -Plasmodesmata of plant cells
• Cell-cell recognition of animal cells
• -cell surface receptor proteins

• Local signaling involves local regulators
• Long-distance signaling involves hormones released by endocrine cells carried by the bloodstream

Target cell detects signaling molecule

Reception activates intermediate molecule(s) while the message is pass along to one another

• Specific cellular response occurs
• Often involves change in gene expression (+/-)