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Chapter 3 Cell Form and Function

Chapter 3 Cell Form and Function - Chapter 3 Cell Form and...

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Chapter 3 Cell Form and Function Cell Parts Nucleus Cytoplasm- organelles and cytosol Cytosol- Plasma Membrane - - - - Intracellular Extracellular Plasma Membrane components Membrane Lipids Lipids constitute 3 lipids Phospholipid bilayer - - hydrophilic heads -hydrophobic tails – motion of these molecules creates membrane fluidity, an important quality that allows for self repair Cholesterol - Glycolipids - Membrane Proteins
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Proteins constitute - - Integral Proteins - - - Peripheral Proteins - - Membrane protein functions - - - Receptors and Secondary messenger systems - Some cells communicate with chemical signals that cannot enter target cells – membrane receptors bind these messengers (hormones, neurotransmitters) – each receptor is usually specific for one messenger Channel Proteins Integral proteins that form pores (channels) for passage of water or solutes - Gated channels open and close in respond to stimuli - - Membrane Carriers or Pumps -Integral proteins that bind to solutes and transfer them across membrane - Cell Identity Markers - Overview of membrane transport Selectively permeable membrane
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