Tissues Flashcards
Why is the skin stratified epithelium
Needs to be thick to protect underlying tissues for dehydration, chemical and mechanical damage. Also stratified to allow upper layer to be constant lost due to getting rubbed of by clothing etc. Lower (basal) layers produce new cells by mitosis. to replace shed cells
Main types of tissue
Epithelial
Connective
Muscle
Nerve
Type of epithelium in alveoli
simple squamous epithelium. single layer and very thin to permit rapid and efficient gas exchange
Type of connective tissue in lung?
Elastic fibres. To allow recoil to origin shape and size after expiration.
Function of connective tissue
Binds, supports, protects and insulates body cells
Fibroblasts make?
Collagen and elastic fibres
Structure of collagen
Strong and inelastic but very flexible.
Loose Connective tissue is found
almost everywhere; under the skin, between muscles, supporting blood vessels and nerves, alimentary canal.
Function of loose connective tissue
Supports, connects, gives elasticity, gives strength
adipose tissue is found
padding organs, under the skin
adipose tissue does what?
energy storage padding cushioning filling body spaces support insulation
Dense connective tissue is found where
Tendons, attaching muscle to bone, ligaments, in walls of body organs and in their capsules(coverings)
Dense connective tissue does what
Strong and inelastic so attaches things firmly to each other, transfers muscle force to bone, prevents over distension of organs eg bladder, supports and protects internal organs e.g kidney capsule
Blood is found where
In blood vessels
Function of blood
Transports essential nutrients and respiratory gases; distributes heat; carries defence cels and antibodies; regulates body fluid and distribution.
