BIO 226 - Chapter 4

Groups of cells similar in structure that perform common or related function

Study of tissues

- Epithelial Tissue - Covers
- Connective Tissue - Supports
- Muscle Tissue - Produces Movement
- Nerve Tissue - Controls

Internal Communication

- Brain
- Spinal Cord
- Nerves

Contracts to cause movement

- Muscles attached to bones (skeletal)
- Muscles of heart (cardiac)
- Muscles of walls of hollow organs (smooth)

- Forms boundaries between different environments, protects, secretes, absorbs and filters

- Lining of digestive tract organs and other hollow organs
- Skin surface (epidermis)

Supports, protects, binds other tissues together

- Bones
- Tendons
- Fat and other soft padding tissue

- Form boundaries
- Two main types (by location)
- Covering and lining epithelia
- Glandular epithelia

- Protection
- Absorption
- Filtration
- Excretion
- Secretion
- Sensory Reception

- Polarity
- Specialized Contacts
- Supported by connective tissues
- Avascular, but innervated
- Can regenerate

Supply an organ or other body part with nerves

- Apical Surface (upper free) exposed to exterior or cavity

- Basal Suraface (lower, attached)

- Bot surfaces differ in structure and function

- May be smooth and slick

- Most have microvilli (e.g. brush border of intestinal lining)
- increases surface area

- Some have cilia (e.g. lining of trachea)

- Non cellular basal lamina
- Glycoprotein and collagen fibers lies adjacent to basal surface
- Adhesive sheet
- Selective filter
- Scaffolding for cell migration in wound repair

- Covering and lining epithelial tissues fit closely together
- forms continuous sheets

- Specialized contacts bind adjacent cells
- Lateral contacts
- Tight junctions
- desmosomes