CHAPTER 4: TISSUES Flashcards
What is the order of structures, from smallest to largest?
cell
tissues
organs
organ systems
What is a Tissue?
A collection of cells of the same type that perform a common function
4 Major Tissue Types and Their Function
- Connective: bind & supports body parts
- Muscular: moves the body and its parts
- Nervous: receives stimuli & conducts nerve impulses
- Epithelial: covers body surfaces & lines body cavities
Connective Tissue
- Function: binds & supports parts of the body
- Structure: loose cells surrounded by a protein matrix
3 Types of Connective Tissue
- Fibrous:
- Supportive:
- Fluid:
Connective Tissue is composed of:
-specialized cells
-ground substance: fills space between cells, can be solid or fluid
protein fibers
-The ground substance and protein fibers together make up the matrix of the tissue.
Fibrous Connective Tissue
Contains fibroblast cells in a matrix of collagen and elastic fibers
Loose fibrous connective tissue
- is found supporting epithelium and many internal organs
- Adipose tissue: is a special loose fibrous tissue where fat is stored
Dense fibrous connective tissue
contains many collagen fibers packed together
tendon & ligament
tendon: connects muscle to bone
ligament: connects bone to bone at joints
Cartilage structure
- Cells are in chambers called lacunae .
- The matrix is solid but flexible .
2 Types of Cartilage
Hyaline cartilage
- description: fine collagen fibers
- -location: nose, ends of long bones & fetal skeleton
Elastic cartilage
- description: more elastic fibers than collagen fibers
- location: Outer ear
Fibrocartilage
- description: strong collagen fibers
- location: disks between vertebrae
What distinguishes the 3 types of cartilage?
the types of fibers
What is the most common type of cartilage?
hyaline
bone structure
- Cells are in chambers called lacunae .
- The matrix is solid and rigid.
- The matrix is made of collagen and calcium salts
Types of Bone
Compact bone
- structure/ description: made of repeating circular units called osteons which contain the hard matrix & living cells & blood vessels
- location: shafts of long bone
Spongy bone
- structure/ description: an open, latticework with irregular spaces
- location: ends of long bone
Fluid Connective Tissue: blood
- The fluid matrix is called plasma .
- Blood also contains specialized cells called the formed elements
*The 3 Types of Formed Elements and their function
- Red blood Cells: carry oxygen
- White blood cells: fight infection
- Platelets: cell fragments that clot blood
Fluid Connective Tissue: Lymph
- The matrix is a fluid called lymph .
- Contains white blood cells.
Muscular tissue
- made of muscle cells, also known as muscle fibers .
- Muscle cells contain the proteins actin and myosin, which are involved in muscle contraction.
3 Types of Muscle Tissue
- Skeletal
- Smooth
- Cardiac
Skeletal Muscle
long cylindrical cells , multiple nuclei, striated fibers, location: attached to the bone for movement, type of movement: voluntary
Smooth Muscle
spindled cells, one nuclei, lack striations, location: walls of hollow, tubular organs & vessels, intestine, bladder, type of movement: involuntary
Cardiac Muscle
branched cells, single nucleus, striations with darker striations called intercalated disks between cells, location: heart, type of movement: involuntary
Nervous Tissue
Allows for communication between cells
- Receives sensory information (input)
- Processes the information (data processing)
- Generates a motor response (output)
2 Major Cell Types
- Neuron = nerve cell
2. Neuroglia: support/ helper cells
The 3 parts of a neuron are:
- dendrites
- cell body
- axon
Dendrites
carry information toward the cell body
Axons
carry information away from the cell body
What is the difference between a nerve and a nerve cell?
- A nerve cell is called a neuron. The parts of a nerve cell are the cell body, dendrites and axon.
- A nerve is a bundle of axons and connective tissue. It also contains arteries and veins
Neuroglia
Function: a collection of cells that support & nourish neurons
Epithelial Tissue
Description: forms linings and barriers. Lines body cavities, covers body surfaces and found in glands
Location: Cells are anchored by a basement membrane on one side and are free (unattached) on the other side.
How Epithelial Cells are Named
Number of cell layers:
- simple: one layer of cells
- stratified: more than one layer of cells
- pseudostratified: appears to have layers but really has only one layer
Shape of cell:
- Cuboidal: cube-shaped
- Columnar: column-shaped
- Squamous: flattened
Types of Epithelial Tissue
simple squamous epithelial
- shape of cells- thin flat cells: designed for diffusion
- only 1 layer thick
- location: lining of lungs, blood vessels
simple cuboidal epithelial
- only 1 layer thick
- location: lining of kidney tubules, various glands
- absorbs molecules
simple columnar epithelial
-shape of cells: Rectangular
-Simple = 1 layer cells
Goblet cells: secrete mucus
-number of cell layers:
-function: absorption Ciliated cells line the oviduct and propel egg towards uterus
-location: lines digestive tract, oviduct
Pseudostratified columnar epithelial
- shape of cells:
- number of cell layers: 1 layer but looks like more
- contain goblet cells that secrete mucus
- function: mucus traps particles, cilia sweeps mucus to back of throat so it can be swallowed or spit out
- location: lining of trachea
stratified squamous epithelial
- shape of cells:
- number of cell layers: more than 1 layer
- function: multiple cell layers provide protection
- location: skin, nose, mouth esophagus, anal canal, cervix, vagina