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
O
OrganA structure made of different tissues working together to perform a specific function. | |
Organ systemA group of organs working together to carry out a major body function. | |
OrganismA complete living thing. | |
OvariesFemale organs that produce egg cells, estrogen, and progesterone. | |
OvumThe female reproductive cell. | |