15 Question Quiz Flashcards
Tissue
Group of similar cells with a common function
Histology
Study of tissues
What are the 4 major types of tissues
- Epithelial tissue (glandular tissue)
- connective tissue
- muscle tissue
- nervous tissue
What does intercellular junction mean?
Space between cells
Tight junction
Membranes merge and fuse
Create sheet like layers
Ex) blood brain barrier
What are some characteristics about desosomes?
Form “spot welds” structural reinforcement
Gap junctions
Tubular channels between cells
Molecules can move between cells
Epithelial tissue
Covers organs
Lines cavities
Frees surface on outside, basement membrane on inside
Usually lack blood vessels
Cells readily divide
classified according to the cell shape and number of cell layers
How are cells identified?
1) layers:simple(one layer),stratified(2 or more layers),pseudo stratified (appears layered)
2) shapes:squamous(flat),cuboidal(cube),columnar(tall)
Simple squamous
1 layer of flat shaped cells
Diffusion and filtration
Alveoli and capillaries
Found in blood vessels
Simple cuboidal
Single layer of cube shaped cells Secretion and absorption Kidney tubules Covers ovaries Lines ducts of some glands
Simple columnar
Single layer of elongated cells Nuclei usually at same level Have cilia and goblet cells (secrete mucus) Lines uterus, stomach, intestines Secretion and absorption
Pseudostratified columnar
Single layer but appears to be layered
Often has cilia
Protection from infection
Lines respiratory passageways
Stratified squamous
Many cell layers
Protective layer
Lines oral cavity, vagina, anal cavity
Stratified cuboidal
2-3 layers of cube shaped cells
More protection
Ducts of mammary, sweat and salivary glands