The sympathetic nervous system—a web of nerves and neurons running through the spinal cord and spread to virtually every organ in the body—is responsible for arousal and excitement.
It does this via the spinal cord, which runs from the brain down through the back and contains threadlike nerves that branch out to every organ and body part.
脊髓帮助达成了这一切，它从脑开始经由背部向下延伸，包含着散布到身体各处的神经。
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If your doctor leaves pieces of the baby, placenta, umbilical cord, or amniotic sac in your body, you may develop pain, bleeding, or a low grade fever.