BIOL130 Chapter Notes - Chapter 8: Cardiac Muscle Cell, Salivary Gland, Cytoskeleton

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Why do cells need to communicate with each other: single celled organisms yeast mating, multicellular organisms, coordination of: Development (from single cell to trillions of cells) Growth coordinating whole body growth and development with environment. Many of the same types of signal molecules are used for endocrine, paracrine, and neuronal signaling, the crucial difference is in the speed and selectivity with which the signals are delivered to their targets. This receptor generates intracellular signals that differ from those generated by the receptor type on heart muscle cells (d) for such a versatile molecule, acetylcholine has a simple chemical structure. Small hydrophobic signal molecules typically enter the cell and. Steroid hormone mechanism of action: the steroid hormone cortisol acts by activating a transcription regulator, cortisol is one of the hormones produced by the adrenal glands in response to stress. It diffuses directly across the plasma membrane and binds to its receptor protein, which is located in the cytosol.

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