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40. The body needs ___________________ in only small amounts, but these organic molecules are an important part in helping perform cellular reactions. (1 point)


41. When a person loses consciousness due to a head injury from a car crash, the ____________________ keeps the body functioning by regulating the flow of information between the brain and the rest of the body. (1 point)

42. A person with darker skin produced more _______________ than a person with lighter skin . ( 1point )

43. ______________ are chemical messengers that allow an organ to send signals to another distant organ in the body through the blood. ( 1point )

44. When your body is infected with the cold virus , antibodies tag the pathogen’s ________________________, which are found on their outer surface , for destruction by immune cells. ( 1point )