Levels of Organisation in the Body
1. Cells
Are the basic structural and functional unit of all organisms.
2. Tissues
Groups of cells that have a similar structure and perform
specific functions/function.
Four basic types:
1. Epithelial tissues – covering tissues e.g. skin, lung,
bladder, stomach
2. Connective tissues – supporting tissues e.g. bone,
cartilage, tendons.
3. Muscle tissues – concerned with movement e.g.
heart, skeletal muscle – smooth and striated.
4. Nerve tissues – concerned with transmission of
electrical impulses.
3. Organ
A structure made up of several different tissues that perform
a function/functions. E.g. liver, bladder, heart, brain, spleen,
ovary
4. System
A number of organs working together to perform one major
function. E.g. circulatory, respiratory, nervous, endocrine.
5. Organisms
Systems come together to form organisms. Organisms are
independent living things that show al the characteristics of
living things. What are they? (excretion, growth, reproduction,
movement, response)