The heart produces coherent contraction of numerous muscle cells resulting in vigorous electrical activity. Brain to body mass ratio also known as the brain to body weight ratio is the ratio of brain mass to body mass which is hypothesized to be a rough estimate of the intelligence of an animal although fairly inaccurate in many casesa more complex measurement encephalization quotient takes into account allometric effects of widely divergent body sizes across several taxa.
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Measurement of brain in human body. Neuroimaging intelligence testing can be used to study the volumetric measurements of the brain. It produces our every thought action memory feeling and experience of the world. For comparison a newborn human babys brain weighs approximately 350 to 400 grams or three quarters of a pound. Intelligence creativity emotion and memory are a few of the many things governed by the brain. It plays a role in just about every major body system. For mammals the relationship between brain volume and body mass essentially follows a power law with an exponent of about 075.
In comparison the adult brains of many vertebrate speciesincluding some fish reptiles birds and mammalsconsume 2 to 8 percent of their bodys energy. The adult human brain weighs on average about 1214 kg 2631 lb which is about 2 of the total body weight with a volume of around 1260 cm 3 in men and 1130 cm 3 in women. Mehau kulyk science photo library the brain is the most complex organ in the human body. The size of the human brain in terms of weight the average adult human brain weighs in at 1300 to 1400 grams or around 3 pounds. In general smaller animals tend to have larger brains measured as a fraction of body size. The adult brain only constitutes 2 percent of body mass yet it consumes over 20 percent of the bodys energy.
The size of the brain is a frequent topic of study within the fields of anatomy and evolution. Conventional science and medicine have long used the electrocardiogram ecg and the electroencephalogram eeg to assess physiologic function of heart and brain respectively. The brain is an amazing three pound organ that controls all functions of the body interprets information from the outside world and embodies the essence of the mind and soul. As a rule brain size increases with body size but not in a simple linear proportion. The balance of findings for human brain size largely based on participants of european ancestry indicates an average adult brain volume of 1. Brain size is sometimes measured by weight and sometimes by volume.
One question that has been frequently investigated is the relation of brain size to intelligence. Anatomy of the brain overview. There is substantial individual variation with the standard reference range for men being 11801620 g 260357 lb and for women 10301400 g 227309 lb. In terms of length the average brain is around 15 centimeters long. The brain is an organ thats made up of a large mass of nerve tissue thats protected within the skull.
Gallery of Measurement Of Brain In Human Body
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