La presentación del aparato respiratorio de encuentra en la siguiente liga
https://docs.zoho.com/show/publish/85vrg42dc8f33ccfb4108991af66e7a36fca7

La del sistema circulatorio
https://docs.zoho.com/show/publish/85vrg1d4146a847be44e7a0a31a87012beda9

 Las ligas del BLOQUE II son:
 *Sexualidad Humana
https://docs.zoho.com/show/publish/34tnz6cdc7037490a434ab037bb718e5b7234
*Reproducción sexual es:
https://docs.zoho.com/show/publish/9fmva364559abf2d24d08b5e366995ccf4f26
* Fases de la reproducción sexual
https://docs.zoho.com/show/publish/34tnz5180fb595cca41b09e8a14095f5592cb
*Variaciones de la sexualidad
https://docs.zoho.com/show/publish/34tnzcf7c3e9b14564f18b754864199441a09
*Métodos anticonceptivos
https://docs.zoho.com/show/publish/mo2jq3731df1f004f455ab5774f05e74c3511
*Aborto
https://docs.zoho.com/show/publish/mo2jq22832741098047cfaa2dc3d1d2ec5f1f
*Exámenes de gabinete
https://docs.zoho.com/show/publish/mo2jqcab933ee3bc04318ac4fdc5e79ea008a