In contrast to compact bone, spongy bones does not contain true Haversian systems( tiny tubes that form a network in bone and contain blood vessels) but consist of an irregular lattice of thin plates of bone called trabeculae.The spaces between trabeculae are filled with marrow. The cells of the red marrow are responsible for producing blood. Within trabeculae lie lacunae which contain osteocytes.<span> Blood vessels from the periosteum penetrate through to the spongy bone, and osteocytes in the trabeculae are nourished directly from the blood circulating through the marrow cavities.</span>
A rough endoplasmic reticulum has ribosomes on it's surface. A smooth ER does not.
Mitosis would be skin cells, bone cells, and organ cells. Meiosis is sex cells, so sperm and egg cells.
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There are four major types of nonrenewable resources: oil, natural gas, coal, and nuclear energy. Oil, natural gas, and coal are collectively called fossil fuels.
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Embryonic stem cells. Embryonic stem cells come from human embryos that are three to five days old. ...
Non-embryonic (adult) stem cells. ...
Induced pluripotent stem cells (iPSCs) ...
Cord blood stem cells and amniotic fluid stem cells.
