If they don’t make sense in the piece, it could completely change how much you understand.
These are the basis for the entire body.
Cells
Cells are the smallest unit of life.
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To understand what a cell looks like, picture a chicken egg.
Not all cells look alike.
Nerve cells are long, thin and covered in myelin, natural insulation.
Nerve cells conduct impulses, which are used to communicate.
They’re basically the telephone wires of the body, and they look the part.
Muscle cells are thick and elongated, like live rubber bands.
Red blood cells are flat and discoid-shaped.
The shapes of the cells help them with their individual functions.
Each cell serves a specialized purpose in the body.
Muscle cells contract and nerve cells transmit impulses.
Red blood cells bind to oxygen, while white blood cells fight infection.
Connective tissue is a term used for various types of tough, fibrous matter like tendons or ligaments.
Most of the time in first aid, we refer to tissues more than cells.
Cells are typically microscopic, while tissues can be seen and manipulated.
The heart is an organ.
It has muscle tissue, connective tissue, and nerve tissue all working together to pump blood.
Organs can do more than one function and each function can be pretty complicated.
The eyes sense color, movement, and light.
They move and focus.
The biggest organ in (or on) the human body is the skin.
Skin laceration repair with sutures.
