Chapter 1 The Study of Body Function
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Human Physiology Study of how the human body functions. Pathophysiology: How physiological processes are altered in disease or injury.
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Negative Feedback Defending the set point. Reverse the deviation. Produces change in opposite direction.
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Positive Feedback Action of effectors amplifies the change. Is in same direction as change. Examples: Oxytocin (parturition) Voltage gated Na + channels (depolarization)
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Connective Tissue Large amounts of extracellular (ECF) material in the spaces between connective tissue cells. 4 Types of Connective Tissue: Connective tissue proper Cartilage Bone Blood
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Connective Tissue Proper Loose connective tissue: Scattered collagen and tissue fluid. Dermis of skin Dense fibrous connective tissue: Regular arranged. Collagen oriented in same direction. Tendons Irregularly arranged. Resists forces applied in many directions. Capsules and sheaths
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Organs Organs: Composed of at least two primary tissues. Serve different functions of the organ.
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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Body-Fluid Compartments 65-75% of total body weight H 2 0. Intracellular compartment: Fluid inside the cell. 2/3 of H 2 0 Extracellular compartment: 1/3 H Subdivisions: Blood plasma Interstitial fluid