(Terms) Lab Quiz 3 Flashcards
Groups of similar cells which preform a common function
Tissues
Four basic tissue types:
Epithelial tissue, connective tissue, muscle tissue, nervous tissue
A tissue which covers the body, lines body cavities and forms glands
Epithelial Tissue
A tissue which binds and supports various organs
Connective Tissue
A contractile tissue
Muscle Tissue
A tissue which initiates and conducts electrochemical impusles
Nervous Tissue
The study of tissues
Histology
3 primary germ layers in the embryo
Ectoderm, mesoderm, and endoderm
An outer layer that gives rise to the outermost layer of skin and nervous system
Ectoderm
Inner layer, gives rise to the mucous membranes of digestive, respiratory, and urinary tracts as well as digestive glands
Endoderm
(Middle layer) gives rise to a gelatinous tissue called mesenchyme which in turn gives rise to muscle, blood vessels and all connective tissues
Mesoderm
Consists of cells arranged in continuous sheets in a single layer or multiple layers. Covers surfaces, lines body cavities and forms glands.
Epithelium
(Free) surface which faces the external body surface, a body cavity
Apical
Opposite of the appical
Basal
If the cell is found in a single layer it is found in the deepest layer, the basal sits on the:
Basal Lamina
Below the basal lamina is the reticular lamina, a fine network of collagen fibers produced by cells in the connective tissues. Together the two tissues form the:
Basement Membrane
Consists of a single layer of cells, all of which are in contact with the basement membrane
Simple Epithelium
Consists of several layers, superimposed one upon the other, with only the basal cells in contact with the basement membrane
Stratified Epithelium
A single layer of flattened cells
Simple squamous epithelium
Single layer of boxed-shaped cells
Simple cuboidal epithelium
Cells that are rectangular-shaped in cross section
Simple columnar epithelium
Consists of a single layer of columnar cells of varying shapes and heights. Only the tallest cells in this epithelium reach the free surface, the nuclei are staggered at various levels. All the cells in this epithelium contact the basement membrane, the impression of a stratified epithelium is a false one.
Pseudo-stratified columnar epithelium
The most common stratified epithelia in the human body. Composed of several layers of cells, although the number of cells and the thickness of the epithelium vary in different parts of the body. The cells that contact the basement membrane are usually cuboidal in shape and undergo constant mitosis. Can be keratinized or nonkeratinized.
Stratified squamous epithelia
Found in the moist linings of the mouth, pharynx, esophagus, vagina and anus.
Nonkeratinized stratified squamous epithelium
Type of epithelium where the cells near the free surface produce a tough resilient protein called keratin
Keratinized stratified squamous epithelium
The thickness of the epithelium changes as it is subject to pressure. Dome shaped cuboidal cells.
Transitional epithelium
Glands that release their fluid products by exocytosis.
Merocrine (eccrine) glands
Glands that pinch off a portion of the cell as part of the secretion.
Apocrine glands
When whole cells filled with secretion are released.
Holocrine glands.
The most wide-ranging and abundant type of tissue in the human body.
Connective tissue
All connective tissues have 3 structural features in common:
Cells, protein fibers, and ground substance
The fibers and the ground substance together form the ______ ______ of connective tissues.
Extracellular matrix
Cartilage is:
Avascular
Have poor blood supply
Dense connective tissue
Except for cartilage, connective tissues, like epithelia, are supplied with:
Nerves
Supporting connective tissues:
Cartilage, bone
4 types of connective tissues:
Areolar (loose) connective tissue, Adipose connective tissue, Reticular connective tissue, Dense connective tissue
Cell names ending in “____” are immature cells that secrete matrix and are actively mitotic
-blasts
Are present in connective tissue and produce and secrete the matrix components
Fibroblasts
Are present in cartilage and produce and secrete the matrix components
Chondroblasts
Are present in bone and produce and secrete the matrix components
Osteoblasts
Cell names ending in “____” are mature cells involved in maintaining the matrix and are less active
-cytes
The fibers of connective tissues are of three types:
Collagen, elastic, and reticular fibers
The most widespread connective tissue in the human body
Areolar connective tissue
Fibers of this connective tissue are not arranged into a particular pattern, but run in all directions and form a loose network within the ground substance
Areolar connective tissue
The predominant fiber type in Areolar connective tissue. Constructed of the tough fibrous protein collagen and provide high tensile strength to the matrix. Usually appear as broad pink bands in the slide.
Collagen fibers
Appear as thin dark lines. Contain the rubber like protein elastin that allows them to stretch and recoil.
Elastic fibers.
An actively mitotic cell that secretes the group substance and fibers
Fibroblast
Type of cell that has a coarse, dark-staining granules in the cytoplasm. Secrete heparin, a chemical that inhibits blood clotting, and histamine, a chemical that increase blood flow by dilating blood vessels.
Mast cell
Large irregularly shaped phagocytic cells that arise from monocytes (type of white blood cell) and wander through connective tissue where they engulf and destroy bacteria, foreign particles and dead or dying body cells.
Macrophages
A fiber that is predominant in reticular connective tissue. Short, thin, branched network of collagen-like fibers.
Reticular fiber
Characterized by large, internal lipid droplet. May appear singly but are more often present in groups.
Adipose cells (or adipocytes)
When adipose cells accumulate in large numbers, they become the predominant cell type and form:
Adipose tissue / fat
Function: diffusion of gasses O2 and CO2 (respiratory gasses)
Present in organs where diffusion occurs
Simple squamous epithelium
Function: secretion and absorption
Simple cuboidal/columnar epithelium
Function: secretion and protection
Pseudostratified Columnar Epithelium
Function: Protects areas of the body against mechanical stress
“Wear and tear”
Non-Keratinized Stratified Squamous Epithelia
Function: Protects areas of the body against mechanical stress
Keratin protects the epithelium and underlying tissues from heat, microbes, and chemicals
Keratinized Stratified Squamous Epithelia
Function: Allows urinary organs to accommodate the pressure changes associated with urine volume without rupturing the organ
Transitional Epithelium
Function: Secretion
Goblet cell
Function: Attach skin to underlying tissue, fill the place between various organs & hold them in place
Surrounds & supports blood vessels
Areolar (Loose) Connective Tissue
Function: Forms the internal framework of organs
Closely related to blood vessels and nerve
Reticular Connective Tissue
Function: Storage site for lipids
Pads & protects regions of the body (shock absorber)
Insulation (regulate body temperature)
Adipose Connective Tissue
There are two types of dense connective tissue:
Regular and irregular
Function: Resist pulling forces in a single direction
Fibers are organized into a parallel pattern
Dense regular connective tissue
Function: Resist pulling forces in several directions
Collagen fibers are thicker and run in several directions
Dense irregular connective tissue
A tendon is a structure that attaches muscle to bone and is composed of:
Dense regular connective tissue
Closely related to the dense connective tissues
Cartilage
Also composed of cells, fibers, and ground substance
Cartilage
Three types of cartilage:
Hyaline cartilage, elastic cartilage, and fibrocartilage
Most types of cartilage are surrounded by a layer of dense connective tissue known as:
Perichondrium
The inner layer of the perichondrium is a region of transition where the collagen fibers merge with the ground substance and it is in this region that the ________ are formed.
Chondroblasts
Produce a new matrix in cartilage
Chondroblasts
The mature cartilage cells are called ____ and are found in spaces (or lacunae) deeper in the matrix.
Chondrocytes
The most common type of cartilage.
Hyaline cartilage
Similar to hyaline cartilage but the matrix is characterized by an abundance of elastic fibers.
Elastic cartilage
Less organized than other cartilage types and lacks a perichondrium.
Fibrocartilage
Two basic types of bone:
Spongy (or cancellous) bone and compact bone
Compact bone is composed of a solid sheet of bone tissue organized into structural units called:
Osteons or Haversian systems
An osteon consists of a concentric ring of bone called:
Lamalle
Mature bone cells
Osteocytes
Osteocytes are found in space (_____) between lamalle
Lacunae
Bone is a highly ______ tissue.
Vascular
A connective tissue layer surrounding the bone.
Periosteum
Connect to the central canals that run longitudinally through the bone.
Perforating (Volkmann) canals
Blood vessels located in the periosteum ____ compact bone through transverse perforating (Volkmann) canals .
Penetrate
Network of small canals that radiate from each lacunae.
Canaliculi
The matrix of the bone is hard and rigid due to the presence of inorganic mineral salts (mostly _____ and _____).
Calcium; Phosphates
___ removes the inorganic salts from the bone which causes the bone to become soft.
Acid
_____ the bones removes the organic constitutes, which causes the bone to become brittle.
Baking
Function: Support with some flexibility.
Forms most of the embryonic skeleton.
Hyaline Cartilage
Function: Provides strength, and elasticity, and maintains the shape of certain structure
Elastic Cartilage Connective Tissue
Function: Provides strong support and can withstand heavy pressure.
Fibrocartilage Connective Tissue
Function: Provides support and protection for parts of the body.
Provides cavities for fat storage and synthesis of blood cells.
Serves as a storehouse for the minerals, calcium and phosphorus required for various functions carried out by the body.
Compact bone
Function: Provides support and protection for parts of the body.
Provides cavities for fat storage and synthesis of blood cells.
Serves as a storehouse for the minerals, calcium and phosphorus required for various functions carried out by the body.
Filled with bone marrow.
Spongy bone
Muscle cells are also called:
Muscle fibers
Have an elongated shape:
Muscle fibers
The cytoplasm of the muscle cell:
Sarcoplasm
The cell membrane of the muscle cell:
Sarcolemma
3 types of muscle tissue found in the human body:
Skeletal muscle tissue, smooth muscle tissue, and cardiac muscle tissue
Obvious transverse bands:
Stirations
Skeletal muscle tissue is located within:
Skeletal muscles
Cardiac muscle tissue is characterized by cells that branch in an irregular pattern and cells join end-to-end by special regions called:
Intercalated discs
There are two major divisions of the nervous system:
Central nervous system and peripheral nervous system
Consists of the brain and spinal cord
Central nervous system
(System) All nervous tissue outside the brain and spinal cord
Peripheral nervous system
The structural and functional units of nervous tissue
Neurons
The largest and most prominent cells of nervous tissue
Neurons
Typical neuron includes:
Cell body (soma), dendrites, and axon
Aggregations of rough endoplasmic reticulum
Nissl bodies
Important elements of cytoskeleton
Neurfibrils
Fatty sheath that may cover an axon
Myelin
Small gaps in the myelin sheath are called:
Nodes of Ranvier
Nodes of Ranvier enable the nerve impulses to jump from node to node, _____ the speed at which an impulse travels.
Increasing
Fine branched endings of the axon
Telodendrites (axon terminals)
Two distinct areas observed in nervous tissue:
Grey matter and white matter
Outside the nervous system, neuron cell bodies are clustered within structures known as:
Ganglia
Line body cavities that open to the exterior such as those of the hollow organs of the digestive, respiratory, reproductive and urinary tracts.
Mucous membranes
Located in: Lung (pink) Capillary walls Lymphatic vessels Kidney Liver Heart Blood vessels
Simple Squamous Epithelium
Located in:
Thyroid gland
Kidney tubules
Ducts of many glands
Simple Cuboidal Epithelium
Located in: Stomach Small intestine Large intestine Ducts of various glands
Simple Columnar Epithelium
Located in: Stomach Small intestine Large intestine Ducts of various glands
Simple Columnar Epithelium
Located in: Respiratory tract Nasal cavities Trachea Bronchi
Pseudostratified Columnar Epithelium
Located in: Most linings of mouth Pharynx Esophagus Vagina Anus
Non-Keratinized Stratified Squamous Epithelia
Located in:
Surface of the skin
Keratinized Stratified Squamous Epithelia
Located in:
Urinary bladder
Ureters (tubes that propel urine from the kidneys to the urinary bladder)
Upper portion of urethra
Transitional Epithelium
Located in: Exocrine glands Found beneath the covering epithelium as single or cluster of cells Sweat glands Mammary glands Sebaceous glands Pancreatic glands
Goblet cell Epithelium Glandular
Located in:
Between various glands
Areolar (Loose) Connective Tissue
Located in: Spleen Liver Bone marrow Lymph nodes
Reticular Connective Tissue
Located in:
Under the skin
Around kidneys, heart, and eyeballs
Within the abdomen and breasts
Adipose Connective Tissue
Located in:
Ligaments (which link bone to bone at joints)
Tendons (connections between bones or cartilage and muscle)
Dense Regular Connective Tissue
Located in:
Skin Dermis
Forms fibrous coverings around organs (kidney, muscles, bones and nerves)
Dense Irregular Connective Tissue
Located in:
Articular surfaces of bones, the ends of the ribs and as part of the nasal septum, larynx, trachea and bronchi
Hyaline Cartilage
Located in:
External ear (the pinna)
The epiglottis
Wall of auditory (eustachian) tube
Elastic Cartilage Connective Tissue
Located in:
Pads
Vertebral discs between the individual vertebrae
Knee menisci between the tibia and femur
Pubic symphysis (joint between the pubic bones of the pelvis)
Fibrocartilage Connective Tissue
Located in:
Throughout the body.
External layer of the bone and is thickest along the length of the bone
Bone Connective Tissue - Compact Bone
Located in:
Throughout the body.
Internal part of the bone generally at the expanded ends of a bone.
Bone Connective Tissue - Spongy Bone
Located in:
Attached to the bone
Skeletal Muscle Tissue
Located in: Within the walls of hollow organs - Blood vessels - Digestive organs - Urinary tract - Respiratory tract - Reproductive Tract
Smooth Muscle Tissue
Located in:
The walls of the heart
Cardiac Muscle Tissue
Located in:
Spinal cord
Spinal Cord Ganglion
Located in:
Hair covered areas of the skin
Hair Follicle and Sebaceous Glands
Located in:
Upper dermis, project into epidermis
Meissner’s Corpuscle
Located in:
In the dermis
Pacinian Corpuscle
Function:
Contraction moves the skeleton
Skeletal Muscle Tissue
Function:
Contraction moves materials along internal passageways and regulates the diameter of blood vessels and respiratory tracts
Smooth Muscle Tissue
Function:
Contraction circulates the blood throughout the body
Cardiac Muscle Tissue
Function:
Relay the sensory nerve impulses from the periphery to the peripheral nervous system.
Spinal Cord Ganglion
Function:
Send & receive sensory information
Spinal Cord & Neuron Smear
Function:
Secrete sebum
Hair growth
Hair Follicle and Sebaceous Glands
Function:
Light touch sensor
Meissner’s Corpuscle
Function:
Deep pressure sensor
Pacinian Corpuscle