This illustration shows that during heart failure, stress signals are transmitted to the brain, which then communicates through the nerves to the hematopoietic stem cells in the bone marrow ...

Specialised animal cells have components that allow them to complete a specific purpose. Specialised animal cells include red blood cells, sperm, eggs, nerve cells, muscle cells, ciliated cells ...

The diagram below shows the same plant cell, as viewed with the light microscope, and with the transmission electron microscope. Animal and plant cells have certain structures in common.