BIOLOGY
BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 47, Problem 3DA
Summary Introduction

To determine: The benefit of taking 100% oxygen following bout of intense exercise.

Introduction: The partial pressure of carbon dioxide determines the pH of the body tissues as it is circulated through the blood to all the body tissues and is exchanged with oxygen. The body tissues have high partial pressure of carbon dioxide due to anaerobic respiration and low partial pressure of oxygen which helps to exchange carbon dioxide and oxygen.

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The below graph shows both ventilation and blood lactate concentration as a function of total oxygen consumption during a bout of exercise. Explain the relationship between these two variables and why these two measures (ventilatory threshold and lactate threshold) tend to occur around the same level of exercise intensity.
Background information: A static respirometer can be used to measure metabolic rates of small aquatic organisms such as fish and crayfish.  The animal is weighed and placed in the chamber.  The chamber is then filled completely with water and sealed, and the dissolved oxygen level in the water is measured for 30 – 60 minutes. The animal is then removed and the respirometer is rinsed before being filled with clean water for the next trial.  Metabolic rates can be calculated knowing the oxygen consumption rate, the volume of the chamber, and the weight of the animal. The picture shows a typical static respirometer.  The probes on the lid measure dissolved oxygen and temperature and are linked to a computer for data collection. When using a static respirometer, the usual procedure calls for filling the chamber completely with water and making sure there is no air left at the top of the chamber when it is sealed.  Why is this important, i.e., how would trapped air influence the metabolic…
Background information: A static respirometer can be used to measure metabolic rates of small aquatic organisms such as fish and crayfish.  The animal is weighed and placed in the chamber.  The chamber is then filled completely with water and sealed, and the dissolved oxygen level in the water is measured for 30 – 60 minutes. The animal is then removed and the respirometer is rinsed before being filled with clean water for the next trial.  Metabolic rates can be calculated knowing the oxygen consumption rate, the volume of the chamber, and the weight of the animal. The picture shows a typical static respirometer.  The probes on the lid measure dissolved oxygen and temperature and are linked to a computer for data collection.Question -It is common to stop feeding animals for 12 – 24 hours before they are used in metabolic rate trials.  Why is this done?
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