问题：
What are some mind-blowing facts about biology?
生物学上有哪些令人惊奇的现象？
回答：
Brandon O'Gorman：
A few things I’ve learned in my A&P lecture:
下面是我在A&P讲座上学到的一些事：
Tendons are the connective tissue that attaches muscle to bone.
肌腱是连接肌肉和骨头的结缔组织。
Tendons are super strong!
肌腱超有韧性的！
When powerfully pulled in one direction, a fragment of bone will often break before the tendon snaps.
当某一方向收到极强的拉力时，那部分骨头会在肌腱撕裂之前断开。
Interestingly enough, fingerprint patterns, or friction ridges, are determined only partly by genetics.
更有趣的是，指纹图案，或者说皮嵴，只是部分由基因决定。
The intrauterine environment of the fetus also determines the fetus’s fingerprints.
胎儿所处的子宫环境也能对胎儿的指纹样式起决定性作用。
Contact with the uterus itself, another fetus, and the amniotic fluid all contribute to the uniqueness of your fingerprints.
能与子宫本身接触的，包括另一个胎儿，羊水这些都对你的指纹独特性有所贡献。
Skeletal muscles (involved in movement) vary widely in precision.
骨骼肌（参与运动的）在精准度上各有不同。
Individual muscle fibers are controlled by motor neurons, and these connections are known as motor units.
单个肌肉纤维由神经元控制，这些连接被称为运动单元。
In the muscles of the eye, a single motor neuron may control only 4–6 muscle fibers, corresponding to very precise movement.
眼部肌肉中，单个神经元可能只控制4-6个肌肉纤维，对应于非常精细的运动。
In contrast, 1000–2000 muscle fibers may be controlled by one motor neuron in the leg.
相反，腿部肌肉中，1000-2000个肌肉纤维可能只由一个神经元控制。
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