{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Cell Communication

Cell Communication - CELL COMMUNICATION ALL organisms need...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
CELL  COMMUNICATION v   ALL organisms need to  monitor their environment v   All multicellular organisms  need cell-cell communication Ø   Cellular receptors evolved Ø   Signal transduction pathways Ø   Cellular effectors for response  11_05CellSignaling_A.swf
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Three Stages of Cell Communication (Ligand) (High ligand affinity) evoked by ligand-receptor binding highly conserved (very few different pathways) specificity via cell-specific protein expression
Background image of page 2
Communication by Direct Contact Direct passage of ligand between cells through junction Direct contact of extracellular molecules
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Communication via Secreted Ligand (b) Synaptic signaling. A nerve cell releases neurotransmitter molecules into a synapse, stimulating the target cell. Local regulator diffuses through extracellular fluid Target cell Secretory vesicle Electrical signal along nerve cell triggers release of neurotransmitter Neurotransmitter diffuses across synapse Target cell is stimulated LOCAL SIGNALING An example of paracrine signaling Autocrine signaling : self stimulation Paracrine signaling: neighbor cell stimulation
Background image of page 4
Hormone travels in bloodstream to target cells (c) Hormonal signaling. Specialized endocrine cells secrete hormones into body fluids, often the blood.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}