midterms Flashcards
are highly organized units But in multicultural organisms, they do not function in isolation
cells
cellls work
together in-group of similar cells called
tissue
is a group of similar cell and their intercellular substance
that have a similar embryological origin and function together to perform a specialized activity.
tissue
A science that
deals with the study of a tissue is
histology
covers body surface, lines body cavity & ducts and form glands.
epithelial tissue
it forms the outer covering of external body surface and outer covering of some
internal organs. It lines body cavity, interior of respiratory & gastro intestinal tracts, blood vessels & ducts and
make up along with the nervous tissue
Covering and lining epithelium:
It is a
tissue from which gametes (egg & sperm) develops.
Covering and lining epithelium:
it is specialized for absorption, and
filtration with minimal wear & tear. It is a single layered
Simple epithelium
cube shaped
Cuboidal:
Those glands that empties their secretion in to ducts/tubes that empty at the surface of covering.
Exocrine
They ultimately secret their products into the blood system.
Endocrine
is found primarily in the fetus and located in the umbilical cord of the fetus where it supports the cord.
Mucous (Wharton’s Jelly) connective tissue
It is differentiated from mesenchyme and does not change after birth. composes
connective tissue proper, cartilage, osseous (bone) & vascular (blood) tissue
Adult connective tissue
has a more or less fluid intercellular martial and fibroblast.
connective tissue proper
Posses freely branching elastic fibers. They stretch and snap back in to original
shape. They are components of wall of arteries, trachea, bronchial tubes & lungs. It also forms vocal cord.
Elastic connective tissue allows stretching, and provides support & suspension.
Elastic connective tissue:
have no blood vessels and nerves. It consists of a dense network of
collagenous fibers and elastic fibers firmly embedded in chondriotin sulfate.
cartilages
called gristle, most abundant, blue white in color & able to bear weight.
Hyaline cartilage
they are found at the symphysis pubis, in the inter-vertebral discs and knee. It provides support
and protection.
Fibro cartilage
the chondrocyte are located in thread like network of elastic fibers. provides strength and elasticity and maintains the shape of certain organs like epiglottis, larynx, external
part of the ear and Eustachian tube.
Elastic cartilage
are nerve
cells, sensitive to various stimuli.
neurons
are thin pliable layers of epithelial and/or connective tissue.
membranes
contains loose connective tissue covered by a layer of mesothelium.
Serous membrane (serosa)
Serosa is composed of 2 layers
visceral layer
parietal layer
are serous
membrane that line thoracic and heart cavity respectively.
Pleura and pericardium
Unlike to other membranes this membrane does not contain epithelium
Synovial membrane
consist the skin and its derivatives. These include hair, nails, and several types of
glands.
The Integumentary system
s the largest organ in the body occupying almost 2m2 of surface area thickens of 2mm.
skin
is the outer layer of the skin that is made of stratified squamous epithelium
epidermis
a strong, flexible, connective tissue mesh work of collagen, reticular and elastic fibers. Most
part of the skin is composed of this
dermis/ true skin
is next to stratum basale of the epidermis. It
contains loose connective tissue with in the bundles of collagenous fibers.
papillary layer
5 Functions of Skin
Protection
Temperature regulation:
Synthesis
Excretion:
Sensory reception:
Skin’s color is determined by 3 factors
- The presence of melanin a dark pigment produced by specialized cell called melanocyte
- The accumulation of yellow pigment carotene.
- The color of blood reflected through the epidermis
main function of melanin
screen out excessive ultraviolet rays.
Glands of the skin are the
sudoriferous and sebaceous glands.
Most common
Secretion is mostly water with solutes
Cools body down
are small, simple coiled tubular glands distributed over nearly the entire body, and they are absent
over nail beds, margins of lips of vulva, tips of penis.
eccrine glands
Develops scent as bacteria metabolize secretion
Stimulated when frightened, during pain, during emotional upset
are odiferous, found at the armpits, in the dark region around nipples, the outer lips of the vulva,
and the anal and genital regions.
Apocrine glands
are simple branched alveolar glands found in the dermis.
Sebaceous (Oil) glands
is composed of Keratinized threads of cells, which develops from the epidermis.
hair
hair has 2 parts
shaft and roots
functions of hair
- Insulation against cold in scalp
- Against glare in eye brows Screen against foreign particles (eye lashes)
- In the nostrils trap dust particles in the inhaled air
- Protect openings from foreign particles.
is composed of the matrix of
epithelial cells.
bulb
Scalp hair grows ____per day
(an average scalp contain __ hairs).
0.4 m.m
125.000
like hair are modifications of the epidermis. They are made of hard keratin.
nail
Nail grows __ a week.
0.5 m.m
Epithelial layer covering underneath of the fore-hang nail is
hyponychyem.
The proximal part of nail is
lunula,
- a type of skin cancer that affects the
cells of the stratum basale
Basal Cell Carcinoma
-form of skin cancer
that arises when
pigment-producing
cells—known as
melanocytes
melanoma
- is a chronic skin condition caused by an
overactive immune system that speeds up the
life cycle of skin cells. Symptoms include
flaking, inflammation, and thick, white, silvery, or red patches of skin.
PSORIASIS
treatments psoriasis
steroid creams, light therapy and
oral medications, de-stress, avoid
smoking/alcohol
Functions of Skin
Protects from injuries
Acts as barrier and regulates what enters/leaves body.
Regulates body temperature.
Synthesizes, stores vitamins.
Sensory functions
3 Major Layers of skin
epidermis
dermis
hypodermis
Deepest layer mainly made of fat tissue and blood vessels
hypodermis
hypodermis is also called
Subcutaneous
Found in Stratum Basale
Produces melanin for protection from UV radiation.
Responsible for skin color.
Melanoma.
Melanocyte
skin cells in epidermis
melanocyte
Keratinocyte
mature skin cell. Accumulate keratin (protein) as they move outwards.
They eventually fall or rub off.
They form four distinct layers.
Keratinocyte
Functions of the skeletal system:
support
protection
movement
sstorage
blood cell formation
is specialized connective tissue that has the strength of cast iron and lightness of pinewood.
bone
Lowest epidermal layer, near dermis
Good nutrient supply
Reproduces by mitosis
Cuboidal, columnar in shape
Moves to upper epidermis in 27 days.
stratum basale
Living cells
Dividing
8-10 cells thick
Polygonal in appearance
Stratum Spinosum
Poor nutrient supply.
Flatten layer of cells.
3-5 cells thick.
No cell division.
Keratin accumulates
Stratus Granulosum
Found only in very thick skin.
Translucent.
Highly keratinized.
Dead cells
Lucidum
25-30 cells thick.
Cells are filled with keratin and hardened.
Sloughed off constantly.
Outer most layer of epidermis.
Stratum Corneum
- Associated with follicle
- Secretes an oily substance called sebum
Sebaceous Gland
Produces water, salts
Respond to temperature
Respond to pain, emotions
sweat gland
are called long as its length is greater than its width.
- The most obvious long bones are in the arm and leg.
- They act as levers that pulled by contraction of muscles.
long bone
are about equal in length, width and thickness, which are shaped with regular orientation. They occur in
the wrist and ankl
short bones
are thin or curved more often they are flat. This includes ribs, scapulae, sternum and bone of cranium.
flat bones
they do not fit neatly into any other category.
- Examples are the vertebral, facial, and hipbon
irregular bones
are small bones embedded within certain tendons, the fibrous cord that connects muscle to bones.
- Typical sesamoid bones are patella and pisiform carpal bone, which are in the tendon of quadriceps femuris
and flexor carp ulnaris muscle respectively.
sesamoid bones
are most commonly found in the feet.
- They usually occur in the developing bone and do not fuse completely
- They look like extra bones or broken on X-ray
- Sutural (wormian) bones are examples of accessory bones
accessory bones
Sensory Structures of Dermis Deep touch/pressure:
Pacinian corpuscles
Sensory Structures of Dermis Light touch/pressure
Meisner’s corpuscles
Sensory Structures of Dermis Warm temperature: Cold temperature pain
free nerve ending
is composed of cells embedded in a matrix of ground substances and fibers.
bone tissue
forms the outer sheet of a bone. It is very hard and dense.
compact bone tissue
is in the form of an open interlaced pattern that withstands maximum stress
and supports in shifting stress.
spongy bone