The basic unit of all living things.
The centre of an atom.
tissues , e.g. a heart has smooth muscle tissue and cardiac muscle tissue.
Cells. The cells are just floating around in a disorganised way.
Cells and organs
The digestive system
The circular system
The musculoskeletal system
The circulatory system
A group of organs that look similar to each other
A group of organs that have blood running through them
A group of organs that work together to perform a specific function
All the organs that make up one living organism
"During the break down of our food, various waste products are made (including gases) which must be excreted from the body."
"When we run fast our cells require more energy to meet our body's increased demands; therefore our heart must beat faster to get more oxygen to our cells to break down food into energy."
"Inside the uterus, sperm are attached by the woman's immune system."