Is oxygen consumption usually related to the patient’s body surface area?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Is oxygen consumption usually related to the patient’s body surface area?

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Oxygen Consumption -- It can be defined as measure of a person's ability to take in oxygen in to the body tissues up to cells  through respiratory tract  via cardiovascular system and ability of working tissues to use oxygen 

                                     or 

The volume of oxygen consumed by the body in one minute, it is measured in liters or ml / minute at standard temperature , pressure .

Consumption of oxygen normally -- Normally 3.5 to 4 ml / oxygen per minute at normal temperature .

Human need oxygen per day - The average person needs around 0. 84 kg of oxygen per day .The average adult at rest inhales and exhales  7 or 8 liters of air per minute , about 11,000 liters of air in a day .

Air which is inhaled about 20% oxygen and air which is exhaled is about 15% so about 5% of the volume of air is consumed in each breath and converted in to carbon di oxide .Human uses about 550 liters of pure oxygen per day . 

Oxygen up take -- It represent oxygen consumption by tissues and is a function of cardiac out put and difference in oxygen content between venous and arterial blood .

Measurement of oxygen consumption -- It can be calculated by using following formula --

     =( inspired O2 fraction - end tidal O2 fraction ) X minute ventilation 1

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