What explains the increased concentration of Ca++ in the ER?

Cell communication is a basic feature of multicellular organisms. Cells communicate with each other using signaling molecules, which are chemicals that cells secrete.  Here are some basic steps of cell communication: Sending and receiving signals: Cells can receive signals from other cells or their environment. Transmitting signals: Signals must be transmitted across the cell membrane to trigger a response. Moving signals: Once inside the cell, the signal moves from protein to protein. Modifying proteins: Each protein modifies the next in some way. Relaying signals: The proteins that... Show more

Cell communication is a basic feature of multicellular organisms. Cells communicate with each other using signaling molecules, which are chemicals that cells secrete. 

Here are some basic steps of cell communication:
Sending and receiving signals: Cells can receive signals from other cells or their environment.
Transmitting signals: Signals must be transmitted across the cell membrane to trigger a response.
Moving signals: Once inside the cell, the signal moves from protein to protein.
Modifying proteins: Each protein modifies the next in some way.
Relaying signals: The proteins that relay a signal to its destination make up a signaling pathway.
Making changes: Once the signaling molecule is detected, the cells will make changes. 

Different types of cell communication include:
Paracrine signaling: A type of cell-to-cell communication that coordinates activities between neighbors and helps neighboring cells take up cellular identity. This type of communication is only for short distances.
Endocrine signaling: An important process in the body that helps communicate with cells that are far from each other.
Autocrine signaling: An important cell signaling process that doesn't work on any other cells in the body. This process helps to provide more importance to the originated cell itself.

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