원형질이란 원형질막에 의해서 외부와 경계되어지며 <a class="new" title="[[세포질]](Cytoplasm)" href="http://biopedia.org/index.php?title=%EC%84%B8%ED%8F%AC%EC%A7%88%28Cytoplasm%29&amp;action=edit"><font color="#cc2200">세포질(Cytoplasm)</font></a>과 <a class="new" title="핵질(Karyoplasm)" href="http://biopedia.org/index.php?title=%ED%95%B5%EC%A7%88%28Karyoplasm%29&amp;action=edit"><font color="#cc2200">[[핵질]](Karyoplasm)</font></a>로 크게 구분한다.<br />

<a title="[[Cell" href="http://biopedia.org/index.php/Cell">Cell</a> ]] | <a title="Tissue" href="http://biopedia.org/index.php/Tissue">[[Tissue</a> ]] | <a title="Organism" href="http://biopedia.org/index.php/Organism">[[Organism</a> ]] </p>