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An overview of lung capacity, focusing on tidal volume, vital capacity, and how exercise affects these measurements. the role of lungs in oxygen exchange, the concept of tidal volume as the normal amount of air breathed in and out, and vital capacity as the maximum volume that can be exhaled or inhaled. The document also discusses how heavy exercise can impact expiratory reserve volume.
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SC Academic Standards : NGSS DCI: Science and Engineering Practices: S.1A.1; S.1A.2; S.1A.4; S.1A.5; S.1A. Crosscutting Concepts: Patterns; Cause and Effect: Mechanism and Explanation; Systems and Systems Models; Energy and Matter: Flows, Cycles, and Conservation; and Stability and Change. Focus Question(s): What is my lung capacity? What factors affect lung capacity? Conceptual Understanding: Plants and animals have physical characteristics that allow them to receive information from the environment. Structural adaptations within groups of plants and animals allow them to better survive and reproduce. Life is the quality that differentiates living things (organisms) from nonliving objects or those that were once living. All organisms are made up of cells, need food and water, a way to dispose of waste, and an environment in which they can live. Because of the diversity of life on Earth, scientists have developed a way to organize groups of organisms according to their characteristic traits, making it easier to identify and study them. The Animal Kingdom includes a diversity of organisms that have many characteristics in common. Classification of animals is based on structures that function in growth, reproduction, and survival. Animals have both structural and behavioral adaptations that increase the chances of reproduction and survival in changing environments. Multicellular organisms (including humans) are complex systems with specialized cells that perform specific functions. Organs and organ systems are composed of cells that function to serve the needs of cells which in turn serve the needs of the organism. Background: Lungs are balloon-‐like structures in the chest that are used to exchange oxygen and carbon dioxide between your blood and the atmosphere. As you inhale (breathe in), air is drawn into your lungs. As you exhale (breathe out),
you expel gases from your lungs. In the lungs, oxygen from inhaled air moves into your blood (the liquid in animals that carries nutrients and oxygen to cells and takes away wastes) and is carried to the cells throughout the body to produce energy. Also in the lungs, carbon dioxide (a gaseous waste) leaves the blood and enters tubes, then is expelled when you exhale. The breathing rate of a healthy adult at rest is about 12 times a minute. A baby breathes faster, about 30 times a minute. Normally, you breathe through your nose. Air enters the nose and moves down the back of the pharynx (the throat), where it enters the trachea (the breathing tube). At the end of the trachea, the passage splits to form two tubes called bronchi that lead to the lungs. In the lungs, each bronchus divides many times, forming small tubes called bronchioles. At the end of each bronchiole is a balloon-‐shaped structure called an alviolus (air sac). The lungs contain millions of alvioli, and around each are many capillaries. A capillary is the body's smallest blood vessel. Through the capillaries, oxygen from inhaled air is transferred, by diffusion, to the blood, and waste from the blood is diffused into the lungs before being exhaled. The average total lung capacity of an adult human male is about 6 liters of air but only a small amount of this capacity is used during normal breathing. The lung capacity of freediver and world record holder Herbert Nitsch is measured to be 10 Liters. The amount of air that you move in and out of your lungs while breathing normally is called TIDAL VOLUME. This amount of air provides enough oxygen for a person who is resting. Tidal volume is only a fraction of the total lung capacity, about 500 mL; it is possible to inhale and exhale more forcefully and blow out more than 500 ml. In this activity, you will be measuring the vital capacity (the greatest volume you can force out in one deep breath) and the tidal volume (the normal amount of air expelled in one breath) of your own lungs, this actual number can then be compared with a number derived from an equation that measures vital capacity. In effect, you are measuring an actual number, based on laboratory measurements, to a theoretical number, based on an equation. If you have any breathing difficulties (asthma or other condition), you should not participate in this activity, instead only take the data on your lab partner or group. Breathing in very deeply (your inspiratory reserve ), then exhaling as much as you can (contracting your thoracic and abdominal muscles), can increase tidal volume to about 1.4 liters
Average lung volumes in healthy adults Volume Value (litres) In men In women Inspiratory reserve volume 3.0 1. Tidal volume 0.5 0. Expiratory reserve volume 1.1 0. Residual volume 1.2 1. Vital Capacity 4.6 3. Total Lung Capacity 5.8 4. In this lab we will investigate how lung volume (expiratory reserve volume) might differ as a result of heavy exercise. Materials : for each group: a two liter plastic soda bottle (clear, labels ripped off), 2 feet of aquarium tubing, plastic dishpan or shoebox, masking tape, pen.
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Your lung capacity can be increased through regular aerobic workouts, but only by a modest amount. Regular aerobic exercise strengthens and tones the heart and lungs, enabling the pulmonary system to increase the maximum amount of oxygen that the lungs can handle. The average person’s lung capacity can be improved only 5 percent to 15 percent even with frequent intense aerobic workouts).
Student Worksheet: Lungs are balloon-‐like structures in the chest that are used to exchange oxygen and carbon dioxide between your blood and the atmosphere. As you inhale (breathe in), air is drawn into your lungs. As you exhale (breathe out), you expel gases from your lungs. In the lungs, oxygen from inhaled air moves into your blood (the liquid in animals that carries nutrients and oxygen to cells and takes away wastes) and is carried to the cells throughout the body to produce energy. Also in the lungs, carbon dioxide (a gaseous waste) leaves the blood and enters tubes, then is expelled when you exhale. The breathing rate of a healthy adult at rest is about 12 times a minute. A baby breathes faster, about 30 times a minute. Student Name Lung Capacity (normal: tidal volume) Lung Capacity (expiratory reserve volume: before exercise) Lung Capacity (expiratory reserve volume: after exercise) Lung Capacity as calculated using formula 1 2 3 4 5 6 7 8 9 10 AVERAGE Table 1. Data on lung capacity (Liters) before and after strenuous exercise. Estimated Vital Capacity: Research has shown that the capacity of a person's lungs is proportional to the surface area of his or her body. To find the surface area, you will need to know your height and weight. There are a couple of different ways to calculate your body surface area mathematically. Either use the equation Body Surface Area = (SQRT ((height in cm * mass in kg)/3600) or go to a website that has an automatic calculator. Once you have calculated your surface area, a second equation will calculate your estimated vital capacity: Vital Capacity -‐ Males: SA x 2500 Vital Capacity -‐ Females SA x 2000 Height (cm) Mass (kg) Surface Area Vital Capacity
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