BIOL.122 Lecture 2 (no epithelial types)

What are the basic tissue types

Epithelial, Connective, Muscle, Nervous

What forms epithelial cells (embryo layers)

Endo, meso and Ectoderm

What forms nerve tissue (embryo layers)

Ectoderm

What forms connective and muscle tissue (embryo layers)

mesoderm

What are the types of cell junction

tight, adherens, desmosome, hemidesmosome, gap

What do tight junctions produce

an impermeable barrier

where are tight junctions often seen

between 2 epithelial cells

What are adherens junctions connected to

actin filaments to help spread the stress

What are adherens junctions for

to help with everyday stresses

desmosomes

spot holds

what do desmosomes contain

cadherin glycoproteins and keratin filaments

What do hemidesmosomes connect to

the basement membrane

What do gap junctions do

act as a pore between cells to allow for communication

Cell types in nervous tissue

neurons, neuroglia

what is neuroglia

non-conducting material, insulates, supports and protects neurons

three different types of neurone

multipolar, bipolar, unipolar

Qualities of multipolar neurones

Many denrites, many processes

Qualities of bipolar neurones

1 dentrite and the axon, 2 processes

Qualities of unipolar neurones

1 process

What does the somatic NS do

Controls skeletal muscle

What controls the smooth muscle, cardiac muscle, and glands

the sympathetic and parasympathetic nervous system

What does the autonomic NS control

Anything subconscious

Types of muscle tissue

Skeletal, cardiac, smooth

4 features of skeletal muscle

Long cells, striated, parallel fibres, voluntary

4 features of cardiac muscle

In heart walls, cells joined by intercalated discs, striated, involuntary

4 features of smooth muscle

not striated, cells tapered at the ends, central nucleus, found in blood vessels, lung airways, instestines (hollow)

5 features of epithelium

continuous sheets, covers and lines things, avascular, innervated, high cell division rate

What type of junctions are seen in epithelium

Tight junctions

Pseudostratified epithelium

Looks stratified from above, however is only one layer

How are basal cells attatched

hemidesmosomes

2 types of columnar epithelium

simple, stratified, pseudostratified