The system works with the circulatory system to maintain the correct water balance in cells.

endocrine

reproductive

nervous

excretory
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question 6

hormone production during childbirth is an example of feedback.

neutral

positive

negative

none of the above
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question 7

feedback can be either positive or

negative

neutral

both a and b

none of the above
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question 8

the system receives stimuli and transmits a message to the spinal cord or brain.

excretory

endocrine

nervous

none of the above
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question 9

controls are controlled from outside the body.

extrinsic

intrinsic

both a and b

none of the above
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question 10

when muscles use more oxygen, and produce more carbon dioxide, controls cause blood vessels to open wider.

intrinsic

extrinsic

both a and b

none of the above