1 The normal sodium level in human blood is 135 mEq/L. If a blood test taken immediately after a meal reveals a sodium level of 150 mEq/L, what will most likely result?

(1) Antibody production will increase.
(2) The person will move to an ecosystem with a lower sodium level.
(3) The nutritional relationships between humans and other organisms will change.
(4) An adjustment within the human body will be made to restore homeostasis.

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2 The energy an organism requires to transport materials and eliminate wastes is obtained directly from

(1) DNA         (3) hormones
(2) starch        (4) ATP

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3 Which disease damages the human immune system, leaving the body open to certain infectious agents?

(1) flu
(2) AIDS
(3) chicken pox
(4) pneumonia 

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4 What usually results when an organism fails to maintain homeostasis?

(1) Growth rates within organs become equal.
(2) The organism becomes ill or may die.
(3) A constant sugar supply for the cells is produced.
(4) The water balance in the tissues of the organism stabilizes.

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5 Which activity is not a response of human white blood cells to pathogens?

(1) engulfing and destroying bacteria
(2) producing antibodies
(3) identifying invaders for destruction
(4) removing carbon dioxide

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