Ligaments and tendons are both types of connective tissue.
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结 (jié) and 缔 (dì) both mean 'to tie / to bind' — together 结缔 paints exactly what connective tissue does: it ties body parts together. 组织 (zǔzhī) means 'tissue' (also 'organization'). So 结缔组织 = 'binding-tying tissue.'
