This site has a good number of sections for various systems of the human body, but also has some sections for comparison between humans and animals. It should be noted that all systems focues on in the curriculum are discussed on this site with the exception of the respiratory system.
Main site: https://www.bbc.co.uk/bitesize
Humans and animals: https://www.bbc.co.uk/bitesize/topics/zcyycdm
This site allows you to not only explore various systems of the human body, but to see the functions and roles of specific organs (upon clicking on them) within each system. Note: to access the part where information is available on each organ, you (and your students) will need to login with your Google account.
Main site: https://www.biodigital.com/
Systems of the human body (when logged in): https://human.biodigital.com/results/modules?categoryId=system&type=Category
This game of Blooket can either give students an introduction to the wide range of vocabulary in this unit, or can be used as some good review of the five systems focused upon in this unit.
This site has the systems of the human body clearly divided into twelve systems, and the five systems that were focused on in this unit are very clearly independent from each other on the site. There are a couple nice parts that set this site apart; two notable ones are that in the 2D view there is a list of organs for each system (even though the list is a little extensive for grade five) and in the 3D view, students can easily make various organs of a system visible and not visible to really understand where organs are in relation to each other and the size of the organs in comparison to one another.
Main Site: https://www.innerbody.com/
Systems of the Body: https://www.innerbody.com/htm/body.html
If you can think back to the days of the overheads, this is like a site where using sliders, you can decide how light or dark multiple "overheads" are that are laying on top of each other. Students can then see the spatial relationship between organs of various systems.Â
Interactive Human Body: https://www.labxchange.org/library/items/lb:LabXchange:e40b2431:lx_simulation:1?fullscreen=true
In this simulation there is a number of comparisons drawn between the cardiovascular system of the humans and the vascular system of the plants. There is certainly material in addition to this, but this key piece is included in here.
Plant Power: https://lessons.seedyourfuture.org/bloom/plantpower/index.htm