Concise, organized, and general notes on the tissue. Includes epithelial (epithelium) tissue, connective tissue, muscle tissue (with skeletal, smooth, cardiac), and nervous tissue. Diagrams and tables included.
Types of Tissues
4 Types
1. Epithelial Tissue (Epithelium): Covers body surfaces, lines cavities, and forms glands.
2. Connective Tissue: Binds cells and organs, providing support and protection.
3. Muscle Tissue: Excitable and contracts to facilitate movement.
- Types:
a. Skeletal Muscle: Voluntary control.
b. Smooth Muscle: Involuntary control in organs.
c. Cardiac Muscle: Heart muscle, involuntary.
4. Nervous Tissue: Propagates electrochemical signals (nerve impulses) for communication
Tissue Membranes
Thin layers of cells covering body surfaces and organs.
- Types:
1. Connective Tissue: Formed from connective tissue (e.g., synovial membranes in joints).
2. Epithelial Membranes: Composed of epithelium and underlying connective tissue.
3. Mucous Membranes: Line cavities open to exterior (e.g., digestive, respiratory tracts).
4. Serous Membranes: Line closed body cavities; secrete serous fluid for lubrication (e.g.,
pleura, pericardium, peritoneum).
5. Cutaneous Membrane: Skin; stratified squamous epithelium with keratinized cells.
Epithelial Tissue
Features
- Cellularity: Highly cellular with minimal extracellular material.
- Cell Junctions: Special connections between cells (tight, anchoring, and gap junctions).
- Basement Membrane: Made of basal lamina (glycoproteins+collagen) & reticular lamina
- Avascular: No blood vessels; nutrients diffuse from underlying tissues.
Functions
- Protection: First line against physical, chemical, and biological damage.
- Permeability Control: Selective transfer of materials.
- Secretion: Release of mucus and enzymes (e.g., digestive enzymes in the small intestine).
Epithelial Cell Types
- Cilia: Extensions that help move fluids and particles (e.g., in respiratory tract).
- Goblet Cells: Mucus-secreting cells interspersed among epithelial cells.
, Types of Cell Junctions
- Tight Junctions: Prevent passage between cells, creating a barrier.
- Anchoring Junctions: Stabilize tissue; includes desmosomes, hemidesmosomes
- Gap Junctions: Allow communication between adjacent cells.
Classification of Epithelial Tissue
- By Cell Shape:
a. Squamous: Flattened cells.
b. Cuboidal: Box-like cells.
c. Columnar: Taller than wide cells.
- By Layering:
a. Simple Epithelium: Single layer.
b. Stratified Epithelium: Multiple layers.
c. Pseudostratified: Appears stratified but is a single layer.
d. Transitional: Specialized for stretching (e.g., bladder).
Specific Types of Epithelial Tissue
Tissue Looks Function Location
Simple Cuboidal absorbs and secretes kidney tubules, glands
Simple Columnar absorbs and secretes digestive tract
Pseudostratified secretes mucus and respiratory tract
Columnar moves particles
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller tael. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $6.49. You're not tied to anything after your purchase.