Ulcer

An Ulcer is an open sore on an external or internal surface of the body, It can be caused by a break in tie skin or mucous membrane which fails to heal itself.

An Ulcer can range from small, Painful sores in the mouth to bedsores and serious lesions of the stomach or intestine.

The human body system

The human body system. Cell, Tissue, Muscle, Organ, System, Body.

The cell is made from different parts of the body organ.

Each part has many roles in a single human system, I know what you think what I am talking about, 
well, it's start off with the (muscle cell) as you see in the image.

Muscle Cell is found in our Muscle Tissue, the Muscle Tissue is soft but that can compose muscles in animal bodies, that gives a rise to the muscles and ability to contract within the cell.

The average heart is the size of a fist in an adult but you're Heart can beat at 115,000 times each day. And it pumps over 115,000 blood times each day,
and our heart has an Electrical System Controls the rhythm every time it beats the heart.

There are 11 major that works together Organ Systems,
on Google search, I find some things to help to make it easy for you.😊

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- integumentary,
- muscular,
- skeletal,
- nervous,
- circulatory,
- lymphatic,
- respiratory,
- endocrine,
- urinary/excretory,
- reproductive and digestive. 

but you can search them up so you can learn for your self and express what it means to your self.
And to be honest I'm too lazy but you can find some interesting facts about the system and cell and the others.