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Physics of the Mind and BodyPhysics 290Winter 2002

Professor Timothy Chupp

Topics• Mechanics of the human body• Gas laws and the lungs• Cardiovascular fluid flow• Light and vision• Sound and hearing• E&M in neuroscience• Lasers in medicine• Ionizing radiation and the body• Nuclear Medicine• Magnetic Resonance and imaging• Ultrasonography

Lecture 1: Introduction toPhysics of the Mind and Body

F=ma

• Physics is the science of general principlesthat can be applied to complex phenomena

• The simplest principles:

• Describe complex phenomena– Motions of the planets– Riding a bicycle (with torque)– Flow of blood (with fluid dynamics)

Brief History of PhysicsWhen What Who16th Century Motion Galileo17th Century Dynamics Newton18th Century Light, Electricity, Magnetism Young,Henry,

Oersted,Volta19th Century Thermodynamics Boltzman

Electromagnetism Maxwell20th Century Electron Thompson (1895)

X-rays Roentgen (1896)Nucleus Rutherford (1911)Radioactivity Bequerel\Curie (1920)Spin Goudschmidt

Uhlenbeck (1925)Nuclear Energy Hahn/Meitner (1930)NMR Bloch/Purcell (1945)Transistor Bardeen (1948)Laser Shalow/Townes (1955)Complexity/Organization/Structure Biophysics

21st century Physics of the Mind and Body

MEASUREMENT

• Pulse Rates (15 seconds):

• Model your body– Arm Length/Circumfrence (upper and lower)– Leg Length/ Circumfrence (upper and lower)– Thorax Length/ Circumfrence (upper and lower)– Head diameter

tissue density 1x103 kg/m3

bone density 1.9x103 kg/m3

Ravg= (1/N) S Ri

s= (1/N-1) S (Ravg-Ri)2

Pulse Rate HistogramJanuary 7, 2003 (in class)

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Num

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908070605040Pulse Rate (per minute)

MRI Bones are Gray/BlackXrays: Bones are Light