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