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FISIOLOGI SENAM Control of the internal enviroment
1.
Scott K. Powers
• Edward T. HowleyScott K. Powers • Edward T. Howley Theory and Application to Fitness and PerformanceTheory and Application to Fitness and Performance SEVENTH EDITION Chapter Presentation prepared by: Brian B. Parr, Ph.D. University of South Carolina Aiken Copyright ©2009 The McGraw-Hill Companies, Inc. Permission required for reproduction or display outside of classroom use. Control of the Internal Environment
2.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Objectives 1. Define the terms homeostasis and steady state. 2. Diagram and discuss a biological control system. 3. Give an example of a biological control system. 4. Explain the terms negative feedback and positive feedback. 5. Define what is meant by the gain of a control system.
3.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Outline Homeostasis: Dynamic Constancy Control Systems of the Body Nature of the Control Systems Negative Feedback Positive Feedback Gain of a Control System Examples of Homeostatic Control Regulation of Body Temperature Regulation of Blood Glucose Stress Proteins Assist in the Regulation of Cellular Homeostasis Exercise: A Test of Homeostatic Control
4.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Research Focus 2.1 How to Understand Graphs • Used to illustrate relationships between two variables • Independent variable – On x-axis (horizontal) – Manipulated by researcher • Dependent variable – On y-axis (vertical) – Changes as a function of independent variable
5.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Figure 2.1 The relationship between heart rate and exercise intensity Research Focus 2.1 How to Understand Graphs Independent variable Dependent variable, changes as a function of exercise intensity.
6.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Homeostasis: Dynamic Constancy • Homeostasis – Maintenance of a constant and “normal” internal environment • Steady state – Physiological variable is unchanging, but not necessarily “normal” – Balance between demands placed on body and the body’s response to those demands – Examples: Body temperature Arterial blood pressure Homeostasis: Dynamic Constancy
7.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Changes in Body Core Temperature During Exercise Figure 2.2 Changes in body core temperature during submaximal exercise Body temperature reaches a plateau (steady state) Homeostasis: Dynamic Constancy
8.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Changes in Arterial Blood Pressure at Rest Figure 2.3 Changes in arterial blood pressure at rest Although arterial pressure oscillates over time, mean pressure remains constant Homeostasis: Dynamic Constancy
9.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. In Summary Homeostasis is defined as the maintenance of a constant or unchanging “normal” internal environment during unstressed conditions. The term steady state is also defined as a constant internal environment, but this does not necessarily mean that the internal environment is at rest and normal. When the body is in a steady state, a balance has been achieved between the demands placed on the body and the body’s response to those demands. Homeostasis: Dynamic Constancy
10.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Control Systems of the Body • Intracellular control systems – Protein breakdown and synthesis – Energy production – Maintenance of stored nutrients • Organ systems – Pulmonary and circulatory systems Replenish oxygen and remove carbon dioxide Control Systems of the Body
11.
Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Non-Biological Control System Figure 2.4 A thermostat-controlled heating/cooling system An increase in temperature above the set point signals the air conditioner to turn on. A decrease in room temperature below the set point results in turning on the furnace. Nature of the Control Systems
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The McGraw-Hill Companies, Inc. All Rights Reserved. Biological Control System • Series of interconnected components that maintain a physical or chemical parameter at a near constant value • Components – Sensor or receptor : Detects changes in variable – Control center: Assesses input and initiates response – Effector: Changes internal environment back to normal Nature of the Control Systems
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Components of a Biological Control System Figure 2.5 Components of a biological control system Nature of the Control Systems
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Negative Feedback • Response reverses the initial disturbance in homeostasis • Example: – Increase in extracellular CO2 triggers a receptor – Sends information to respiratory control center – Respiratory muscles are activated to increase breathing – CO2 concentration returns to normal • Most control systems work via negative feedback Nature of the Control Systems
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Positive Feedback • Response increases the original stimulus • Example: – Initiation of childbirth stimulates receptors in cervix – Sends message to brain – Release of oxytocin from pituitary gland – Oxytocin promotes increased uterine contractions Nature of the Control Systems
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The McGraw-Hill Companies, Inc. All Rights Reserved. Gain of a control system • Degree to which a control system maintains homeostasis • System with large gain is more capable of maintaining homeostasis than system with low gain – Pulmonary and cardiovascular systems have large gains Nature of the Control Systems
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. In Summary A biological control system is composed of a sensor, a control center, and an effector. Most control systems act by way of negative feedback. The degree to which a control system maintains homeostasis is termed the gain of the system. A control system with a large gain is more capable of maintaining homeostasis than a system with a low gain. Nature of the Control Systems
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The McGraw-Hill Companies, Inc. All Rights Reserved. Examples of Homeostatic Control • Regulation of body temperature – Thermal receptors send message to brain – Response by skin blood vessels and sweat glands regulates temperature • Regulation of blood glucose – Requires the hormone insulin – Diabetes Failure of blood glucose control system • Regulation of cellular homeostasis – Stress proteins (heat shock proteins) Repair damaged proteins to restore homeostasis in response to changes in temperature, pH, and free radicals Examples of Homeostatic Control
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The McGraw-Hill Companies, Inc. All Rights Reserved. Regulation of Body Temperature Figure 2.6 Negative feedback mechanism to regulate body temperature Examples of Homeostatic Control
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The McGraw-Hill Companies, Inc. All Rights Reserved. Regulation of Blood Glucose Figure 2.7 Illustration of the regulation of blood glucose concentration The pancreas acts as both the sensor and effector organ Negative feedback Examples of Homeostatic Control
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The McGraw-Hill Companies, Inc. All Rights Reserved. Clinical Applications 2.1 Failure of a Biological Control System Results in Disease • Failure of any component of a control system results in a disturbance of homeostasis • Example: – Type 1 diabetes Damage to beta cells in pancreas Insulin is no longer released into blood Hyperglycemia results – This represents failure of “effector” Examples of Homeostatic Control
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The McGraw-Hill Companies, Inc. All Rights Reserved. Research Focus 2.2 Stress Proteins Help Maintain Cellular Homeostasis • Cells synthesize “stress proteins” when homeostasis is disrupted – Heat shock proteins • Stresses include: – High temperature – Low cellular energy levels – Abnormal pH – Alterations in cell calcium – Protein damage by free radicals • Exercise induces these stresses Examples of Homeostatic Control
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Example of Homeostatic Control: Cellular Stress Response Figure 2.8 The cellular stress response Examples of Homeostatic Control
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The McGraw-Hill Companies, Inc. All Rights Reserved. Exercise • Exercise disrupts homeostasis by changes in pH, O2, CO2, and temperature • Control systems are capable of maintaining steady state during submaximal exercise in a cool environment • Intense exercise or prolonged exercise in a hot/humid environment may exceed the ability to maintain steady state – May result in fatigue and cessation of exercise Exercise: A Test of Homeostatic Control
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. In Summary Exercise represents a challenge to the body’s control systems to maintain homeostasis. In general, the body’s control systems are capable of maintaining a steady state during most types of exercise in a cool environment. However, intense exercise or prolonged work in a hostile environment (i.e., high temperature/ humidity) may exceed the ability of a control system to maintain steady state, and severe disturbances of homeostasis may occur. Exercise: A Test of Homeostatic Control
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Chapter 2 Copyright ©2009
The McGraw-Hill Companies, Inc. All Rights Reserved. Study Questions 1. Define the term homeostasis. How does it differ from the term steady state? 2. Cite an example of a biological homeostasis control system. 3. Draw a simple diagram that demonstrates the relationship between the components of a biological control system. 4. Briefly, explain the role of the sensor, the integrating center, and the effector organ in a biological control system. 5. Explain the terms negative feedback and positive feedback. Give a biological example of negative feedback. 6. Discuss the concept of gain associated with a biological control system.
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