Tissues - How do things move across the plasma membrane...

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How do things move across the plasma membrane?
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Plasma Membrane selectively permeable Most substances must use proteins to cell; proteins are selective Lipids move freely through bilayer
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Passive Transport Active Transport How do things move across the plasma membrane?
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Passive Transport Does not require Adenosine Triphosphate or ATP (energy) Involves diffusion across the membrane - net random movement of molecules from an area of high concentration to an area of low concentration (down the concentration gradient)
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Facilitated
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Glucose and water Where glucose cannot cross the membrane passively but water can
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Active Transport Does require ATP (energy) net random movement of molecules from an area of low concentration to an area of high concentration (against the concentration gradient)
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Which is passive transport? Which is active transport?
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Tissues, Organ Systems and Homeostasis
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“Form Follows Function” Anatomy Physiology Bird Example
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Organization of the Animal Body Animals’ bodies exhibit hierarchical organization – Biological molecules are organized into organelles (ex. Phospholipids and proteins are arranged into the plasma membrane) Organelles are organized into a cell (ex. Nucleus + plasma membrane + cytoplasm proper + many organelles = cell)
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Organization of the Animal Body (continued) Hierarchical organization continued – Groups of similar cell s are organized into tissues (ex. Cardiac muscle cells are organized into the tissue, cardiac muscle); Note that the evolution of multicellular living forms required development of tissues Two or more tissues are organized to form an organ (ex. Cardiac muscle tissue + connective tissue + epithelial tissue = the heart; provides force to move blood)
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Organization of the Animal Body (continued) Hierarchical organization continued – Organs are organized into organ systems (ex. Heart + blood vessels + blood = cardiovascular system; function is transport) Organ systems are organized into an organism (ex. An animal consists of 11 organ systems)
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Figure 20.2
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This note was uploaded on 04/10/2008 for the course BIOL 155 taught by Professor Stewart during the Spring '08 term at California State University Los Angeles .

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Tissues - How do things move across the plasma membrane...

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