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16 Cards in this Set
- Front
- Back
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What is the general process for cell communication? |
A plasma membrane walls the cell in and communicates with the outside. |
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Cell communication involves what? |
Ligands (signals) and receptors |
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Why is cell communication important? |
It coordinates cellular activities in a multicellular organism and promotes cell division. |
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What are the receptors on the cell surface? |
Proteins. They signal to the cell what is going on outside. |
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what are the 5 types of signals relayed between cells? |
1. Direct Intercellular Signaling. 2. Contact-depend Signaling. 3. Autocrine Signaling. 4. Paracrine Signaling. 5. Endocrine Signaling. |
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What happens in Direct Intercellular Signaling? |
A bunch of cells that are lined up and have specific paths set up for signals. It's like an open path. Gap junction |
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What happens in contact-Dependent Signaling? |
Signals on surface of the cells must come in contact. There is a a (U) shape on one cell and a (I) shape on another cell. The (I) fits inside of the (U). The cells come in contact with each other and then they can talk. |
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What are the 2 parts of Contact-Dependent Signaling? |
Membrane-Bound signaling Molecule (I) Receptor (U) |
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What happens in Autocrine Signaling?? |
Cells secrete signaling molecules that bind to their own cell surface or neighbornig cells of the save type. They only have receptors. More of a message sent. No instant communication. |
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What happens in Paracrine Signaling? |
Signals sent out by a cell to other cells of a different type. The signal does not affect the cell secreting the signal. This is synaptic signaling. |
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What happens in Endocrine Signaling? |
Hormone signals that travel long distances through the blood stream. Usually longer lasting and can affect all cells in the body. |
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What is synaptic signaling |
signaling in a short distance |
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What are the 3 Stages of cell signaling |
1. Receptor Activation. 2. Signal transduction. 3. Cellular response. |
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What happens in Receptor activation? |
Signaling molecules bind to receptors on the plasma membrane. Causes conformation change of receptor. Activates function. Basically the end that is on the insdie just passes the message forward. |
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What happens in signal transduction? |
Activated receptors stimulate sequences of changes in intracellular proteins in signal transduction pathways |
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What happens in Cellular Response? |
Several different responses depending on target. 1. Alter activity of one or more enzymes. 2. Alter structural protein function. 3. Change gene expression - transcription factor. |
