Anatomy and Physiology Tissues and Cells

Number of cells in human body

75-100 trillion

Number of types of cells

around 200

Life span of a cell

varies

Tissues definition

Group of cells that work together to perform a function

Histology

Study of tissues

Four basic types of tissue

Epithelial, Connective, Muscle, Nervous

Epithelial Tissue functions

To protect, absorb, filter and secrete

Epithelial tissue examples

Skin, linings of organs, Stomach lining, Kidney lining

Simple Epithelium

One layer of tissue

Stratified Epithelium

Two or more layers of tissue

Pseudostratified Epithelium

One layer of tissue that looks like multiple

Squamous cells

Flat like fish scales

Cuboidal cells

Cubes like dice

Columnar cells

Tall rectangles like colums

Connective tissue

Connect body parts and are the most abundant type of tissue

Connective tissue function

Protect, Cover, and Bind

Five types of connective tissue

Bone, Cartilage, Blood, Loose connective tissue, Dense connective tissue

Muscle tissue function

Contract and relax or lengthen and shorten to produce body movement.

four types of muscle tissue

Smooth, Skeletal, Cardiac

Smooth muscle

Involuntary, allows for movement in your organs

Skeletal Muscle

Working with voluntary movement, works with skeletal system to move your body

Cardiac Muscle

Found in the heart, Involuntary, works together to pump blood

Nervous tissue

Made up of cells called neurons

Neurons functions

Receive and send messages through the nerves to the brain and back to the part of the body it came from