Fundamentalunits of life, each designed to perform specialisedfunctions through a process called DIFFERENTIATION
Differentiation
Cells specialise to perform specific functions
Tissues
Groups of similar cells working together to carry out a particular function.
Tissues in mammals
Muscular tissue: Responsible for movement by contracting and relaxing
Glandular tissue: Produces and releases substances like enzymes and hormones
Epithelial tissue: Covers the surfaces of the body, such as the inside of the gut
Organs
group of different tissues working together to carry out a particular function.
Heart
Organ that contains muscular tissue for PUMPING BLOOD around the body
Organ Systems
Groups of ORGANS working together to carry out a particular function.
Musculartissue
Responsible for movement by contracting and relaxing
Glandular tissue
Produces and releases substances like enzymes and hormones
Epithelial tissue
Covers the surfaces of the body, such as the inside of the gut
cells always start off as undifferentiated (has no function).
when genes are switched on, they then become specialised to carry out a specific job.
e.g. specialised muscle cells
The digestive system is considered an organ system because it consists of a group of organs that work together to perform the common function of digesting and absorbing our food.
For e.g: the pancreas releases digestive enzymes (helps break down the food molecules), while the small intestine absorbs the nutrients.
organelles -> cells -> tissues -> organs -> organ systems