Biological Building Blocks of Life

Biological Building Blocks of LifeCell Diversity

Tissue DiversityClassification of Body Membranes

Biological Building Blocks of LifeCell Diversity

Tissue DiversityClassification of Body Membranes

Cell Diversity

• An average human body are made up of 200+ different cell types

• These vary greatly in size, shape and function

• All are derived from one single cell type: stem cell

For simplicity, we will categorize these cells base on their functions

Anatomy: The study of the parts (eg. cells, tissues, organs, systems) of an organism

Physiology: The study of the functions of the parts of an organism

Cells that …

fibroblasts erythrocytes

a) connect body part

b) cover and line body organs

epithelial cells

c) move organs and body parts

muscle cells

d) store nutrients

fat cells

f) gather info & control body functions

nerve cells

e) fight disease

macrophage

g) involve in reproduction

sperm

General Cell Shapes

Cell combinations

Esophagus lining Bladder lining

Tissue Diversity• Tissues are made up of ________ ________

• There are four (4) different types of tissue

muscleepithelia nervous

connective

bone loose connective bloodcartilage

Classification of Epithelial Membrane• Epithelial membrane is a covering organ for many organs

• There are four (4) different types of epithelial membrane we will only discuss two (2) of them

Cutaneous membrane (skin) Mucous membrane

Cutaneous Membrane

• Protect us from: germs and cold drying out of body’s vital fluid mechanical injuries of our soft tissues

• Regulate body’s temperature : evaporate perspiration contract or relax the superficial blood vessels

• Act as organ of sense: it has nerve endings

• Act as biological gate: it can absorb and eliminate certain substances

• Has the fastest renewal rate!

Mucous Membrane

• covers body cavities that open to the outside

• epithelia consist of: stratified squamous simple columnar cells

• is wet because of continuous exposure to secretions

• not all mucosae secrete mucus (eg. cells that line the urinary tract)