basic
What are the 4 basic tissue types?
epithelial
connective
muscle
neural
sensors communicate with?
control centers
Epithelial tissue location and composition
Lines all open spaces
Sheets of cells attached continuously
What are the 4 types of cell junctions?
Tight Junctions
Desmosomes
Hemidesmosomes
Gap Junctions
What is part of the cutaneous membrane?
epidermis (epithelial portion)
dermis (connective tissue portion)
What is the primary protein fiber?
Collagen
control centers communicate with?
effectors
Connective Tissue function and composition
Ties the body together/ties cells down in place
non-cellular material: protein fibers (collagen) + gelatin-like fluid =Extracellular matrix
Connective tissue makes the extracellular matrix
Tight junctions Composition and Role
Composition: made up of CAMs called cadherins
Role: Keep ICF from flowing between cells
What are the accessory structures of the cutaneous membrane?
glands
hair
nails
capillaries
tiny blood vessels connecting arteries to veins
How is the control center in homeostasis communicated with?
hormones and the nervous system
Muscle tissue function
movement by shortening and elongating
Desmosomes Composition and Role
Composition: CAMs specifically cadherins
Role: create a very strong, durable attachment between two cells
ICF can flow between two cells connected by a desmosome
Subcutaneous/superficial fascia/hypodermis (areolar& adipose)
Location
Function
Carries
Provides
Deep to dermis
Allows independent movement of integument/underlying muscles
Carries blood vessels and nerves
Provides temperature insulation and mechanical protection
veins
any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart
Negative Feedback Process
regulated variable changes
change is sensed
control center sends out a response command
effectors respond
regulated variable is brought back to normal
Neural tissue function
Communication
Uses electrical events along cells membranes --> secretion of neurotransmitter onto cell
Hemidesmosomes Composition and Role
Composition: desmosomes (CAMs cadherins)
Role: attaching cells to the proteins of the extracellular matrix not to another cell
What shape of cells make up the epidermis?
How big are they?
What are the epidermis cells called?
stratified squamous epithelium
~.08 mm thick
keratinocytes
regulated variable
any condition that is sensed or regulated via homeostasis
Positive Feedback Process
A regulated variable changes
Change is sensed
Control center sends out a response command
The response builds and builds and builds until an outside source stops the response
What are cell adhesion molecules (CAMs)?
proteins
allow connections of cells to each other or to the Extracellular matrix
The connections can be temporary or permanent
Gap Junctions
Ion channels between 2 cells
Role: allows ions to travel directly from one cell to another
What do melanocytes produce?
What is the function?
Melanin
pigments the skin