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13 terms

Introduction to the human body

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inorganic compounds
usually are small and lack carbon.
organic substances
always contain carbon usually contain hydrogen and always have covalent bonds
water
is the most abundant substance in the body. It is an excellent solvent and suspending medium, participates in hydrolysis and dehydration synthesis reactions and serves as a lubricant. It also has a high capacity for absorbing heat and a high heat of vaporization
water molecules
have many hydrogen bonds making it cohesive and causing it to have a high surface tension.
body fluids
have a PH which must remain fairly constant to maintain homeostasis
Neutrality
is represented by 7 on the pH scale
Acidic solutions
are below 7 on the pH scale
Alkaline solutions
are above 7 on the pH scale
Normal blood pH
7.35 - 7.45
buffer systems
remove or add H+ ions to help maintain pH homeostasis
Carbonic acid - bicarbonate
one of the important buffer sytems
Bicarbonate ion (HCO3)
enables carbon dioxide to be carried safely int he blood stream
Haemoglobin
another important buffer in the transport of respiratory gases