Human Body Systems
完成条件
按索引浏览词汇表
特殊 | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 全部
U
Umbilical CordThe structure that connects the fetus to the placenta. | |
UreaA nitrogen-containing waste product produced in the liver and removed by the kidneys. | |
Urinary systemThe organ system that removes liquid wastes and helps regulate water balance. | |
UterusThe organ where a fertilized egg develops during pregnancy. | |