Tissues! Flashcards
Function of epithelial tissue
Physical protection
Control permeability
Sensation
Produce specialized secretions
Function of connective tissues
Fills internal spaces
Supports other tissues
Transports materials
Stores energy
Function of muscle tissue
Contraction
Function of neural tissue
Carry electrical signals from one part of the body to another
Characteristics of epithelia
Cell junctions Polarity Attachment( basement membrane or basal lamina) Avascularity Regeneration
Apical surfaces
Microvilla
Cilia
Increase absorption or secretion
Move fluid
Tight junctions
Very strong between two plasma membranes. Prevents passage of water and solutes
Gap junctions
Holes between neighbor cells
Allows rapid communication
Allows ions to pass
Spot desmosomes
Hemidesmosomes
Tie cells together and allow bending and twisting
Attach cells to basement membrane
Simple squamous epithelium
Absorption and secretion
Mesothelium lines body cavities
Endothelium lines heart and blood vessels
Stratified squamous epithelia
Protects against attack
Keratin protein adds strength and water resistance
Simple cuboidal epithelia
Secretion and absorption
Found in kidneys and kidney tubules
Transitional epithelium
Allow stretching and recoiling
Found in urinary bladder
Simple columnar epithelium
Absorption and secretion
Pseudostratified columnar epithelium
Has cilia movement and every cell is attached to basal membrane
Glandular epithelia
Endocrine- no ducts, releases hormones into circulation
Exocrine- produces secretion into environment through ducts
Merocrine secretion
Cell remained undisturbed
Apocrine secretion
Top of cell is released with secretion
Holocrine secretion
While cell is destroyed
Functions of connective tissue
Structural framework for body Transport fluids and dissolved material Protection of organs Support of other tissues Storing energy reserves Defending body from invading organisms
3 characteristics of connective tissue
Specialized cells
Solid extra cellular protein fibers
Fluid extra cellular ground substance
Classification of connective tissue
Connective tissue proper- connnect and protect
Fluid connective tissue- transport
Supporting connective tissue- structural strength
Fibroblasts
Are the main cells that make up connective tissue proper
Adipocytes
Fat cells that are connective tissue
Connective tissue fibers
Collagen- strongest
Reticular- framework
Elastic- stretch and fold back
Collagen fibers
Long straight and unbranched
Ex. Tendons and ligaments
Reticular fibers
Resist force, stabilize cells and structures
Ex. Sheaths around organs
Loose connective tissue
Bubble wrap of body
Areolar
Adipose
Reticular
Aponeuroses
Type of dense regular connective tissue that attach in sheets to large flat muscles
Fluid connective tissue
Blood and lymph.
Contains plasma interstitial fluid and lymph
Lymph
Contains immune cells called lymphocytes.
Function is protection
Fluid tissue transport systems
Cardiovascular system- 02 +nutrients
Lymphatic system- protection
Cartilage
Type of supporting connective tissue
Function is shock absorption and protection
Gel type ground substance with random lacunae
Avascular
Bone
Type of supporting connective tissue
Calcified with central organized lacunae
Function is weight support
Chondrocytes
Cartilage cells surrounded by lacunae
Types of cartilage
Hyaline
Elastic cartilage
Fibrocartilage
Hyaline cartilage
Covers bones
Found in synovial joints
Elastic cartilage
Supportive but bends easily
Found in external ear and epiglottis
Fibrocartilage
Limits movement
Found between pubic bones and intervertebral discs
Osteocytes
Bone cells in lacunae
Periosteum
Covers bone surface and contains nerve ending and osteoblasts(cells that can divide)
Types of membranes
Mucous
Serous
Cutaneous
Synovial
Mucous membranes
Line passageways that have external connection
Reduce friction and facilitate absorption and excretion
Found in digestive, respiratory, urinary, and reproductive tracts.
Serous membranes
Have visceral portion(serosa) covering organs
Function is to reduce friction
Three types of serous membranes
Plura- covers lungs
Peritoneum- covers abdominal organs
Pericardium- covers heart
Cutaneous membrane
Stratified squamous epithelium(skin)
Function protection and sensation
Synovial membrane
Line moving joint cavities
Produce synovial fluid and protect ends of bones
3 types of muscle tissue
Skeletal muscle tissue
Cardiac muscle tissue
Smooth muscle tissue
Skeletal muscles cells
Fibers containing many nuclei
Non-dividing
Cardiac muscle cells
Called cardiocytes
Form branching networks connected at intercalated discs connected by tight and gap junctions
Smooth muscle cells
No striations found in walls of hollow organs
Functions of neural tissue
Conduct electrical impulses- stimuli
Sense internal or external environment
Process info and control responses
Found in brain and spinal cord
Types of neural cells
Neurons
Neurolgia
Function of neurons
Perform electrical communication
Function of neurolgia
Support, repair, and supply nutrients to neurons, perform phagocytosis, regulate composition of interstitial fluid around neurons
Cell parts of a neuron
Body
Dendrites- short
Axon- Long
6 types of neurolgia
Microglia Astrocytes Epindemial cells Olygodendrocytes Schwann cells Saltelite cells
Microglia
Inside brain
Function is phagocytosis
Astrocytes
Inside brain
Function is blood brain barrier
Epindermial cells
Inside the brain
Found in brain ventricles
Olygodendrocytes
Found inside the brain
Wrapping axons inside brain
Schwann cells
Outside brain
Wrapping of axons outside of brain