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My teacher tried to describe this question to me, but I just don't get it.

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closed as off-topic by AliceD, rg255, MattDMo, Chris Mar 31 '16 at 5:28

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – AliceD, rg255, MattDMo, Chris
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ If you have anything specific to ask after looking at my answer below, please refine your question. Note that I voted to close because of the textbook-nature of the question and lack of research effort. See the help center on homework for assistance in asking good homework questions. $\endgroup$ – AliceD Mar 30 '16 at 14:11
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See the figure below:

enter image description here

source: Human Anatomy

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