The epidermal cells and stomata have functions similar to those of which two human body systems

Epidermal cells of a plant leaf have a similar function to the skin system of a human. Their common function is protection. The epidermal cells provide coverage of the plant parts and protect it from damage. Also,  the epidermal layer of leaves allow the exchange of water through transpiration and thus, maintains the temperature of the plant body. The same does the human skin system.  
Stomata of the plants are structures similar to the function of the human respiratory system (lungs). Plants use stomata (tiny “holes”) which let the carbon dioxide and oxygen in and out in a process called diffusion.

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