tejidos
TRANSCRIPT
1 Cél ul as y t ej i dos14
Bi ol ogía y Geol ogía
3º ESOPr esenci a de t ej i dos en or gani smos pl ur i cel ul ar es
En los organismos pluricelulares existen diferentes tipos celulares, cada uno de los cuales realiza una función determinada.
Las células con una misma función se unen para formar los tejidos.
Las esponjas carecen de verdaderos tejidos.
Los vertebrados presentan verdaderos tejidos.
1 Cél ul as y t ej i dos23
Bi ol ogía y Geol ogía
3º ESOCél ul as, t ej i dos, ór ganos y si st emas
Célula muscular
Tejido muscular
Órgano (Corazón)
Sistema circulatorio
1 Cél ul as y t ej i dos24
Bi ol ogía y Geol ogía
3º ESOTej i dos, ór ganos y si st emas
EJEMPLOS DE TEJIDOS
EJEMPLOS DE ÓRGANOS Y SUS SISTEMAS
Muscular Cartilaginoso Nervioso Epitelial
CorazónEncéfalo
Hueso
Estómago
Sistema nervioso
Sistema óseo
Sistema digestivo
Sistema circulatorio
1 Cél ul as y t ej i dos15
Bi ol ogía y Geol ogía
3º ESOTej i dos ani mal es
TEJIDO EPITELIAL
TEJIDO NERVIOSOTEJIDO MUSCULAR
TEJIDOS CONECTIVOS
1 Cél ul as y t ej i dos16
Bi ol ogía y Geol ogía
3º ESOTej i do epi t el i al ( I ) . Epi t el i o de r evest i mi ent o
Reviste la superficie exterior del cuerpo y las cavidades del organismo.
Epitelio simple
Epitelio estratificado
Epitelio pseudoestratificado
Slide 5: Gall BladderSimple columnar epithelium lines the gall bladder. Note the underlying connective tissue with blood vessels.Bar = 100 Microns.
Expanded View
Slide 7: Male UrethraA pseudostratified columnar epithelium lines most of the penile urethra.Bar = 50 Microns.
Expanded View
Slide 9: Urinary BladderThe expandible stratified epithelium of the bladder is referred to as transitional epithelium. Note that its surface cells are large rather than flattened as in stratified squamous epithelium.Bar = 50 Microns.
Expanded View
1 Cél ul as y t ej i dos17
Bi ol ogía y Geol ogía
3º ESOTej i do epi t el i al ( I I ) . Epi t el i os gl andul ar es
Contienen células glandulares especializadas en segregar sustancias con destino al interior o al exterior del cuerpo.
Glándulas exocrinas
Glándulas endocrinas
Glándulas mixtas
Slide 15 PancreasThe pancreas, shown here stained with H&E, serves both endocrine and exocrine functions. The round islets of Langerhans are the endocrine portion and serve to identify pancreatic tissue. Bar = 250 Microns
Expanded View
Slide 8 ThyroidThe simple cuboidal epithelium lining the follicles produces the thyroglobulin which is stored in the colloid follicles. Later it is taken back up by these same cells, cleaved, and released as T3 & T4. Notice that the thyroid is the only gland to store its hormones extracellularly.
Expanded View
Slide 6 Simple Tubular The intestinal gland (arrow) is found under the base of the villi. Notice also the goblet cells. Bar = 100 Microns
Expanded View
1 Cél ul as y t ej i dos18
Bi ol ogía y Geol ogía
3º ESOTej i dos conect i vos ( I ) . Tej i dos conj unt i vo y adi poso
Tejido conjuntivo
Tejido adiposo
Fibroblasto
Linfocito Macrófago
Fibras de colágeno
Núcleo del adipocitoAcúmulo de grasa
Tejido conjuntivo
Slide 5 Elastic FibersSheets of elastic fibers, called elastic lamellae, are common in the aorta, shown here. These lamellae give a distinctive refractive appearance when you focus through them. Bar = 100 Microns
Expanded View
Slide 4 Collagen FibersThe Masson (trichrome) stain leaves collagen green or blue. In the skin, Type 1 collagen predominates, as shown by the thick, wavy bundles. Bar = 250 Microns
Expanded View
Slide 10 TendonIn cross section, collagen fibers make up the pale pink background. The fine lines separate fiber bundles; numerous fibroblast nuclei can be seen. Bar = 50 Microns
Expanded View
1 Cél ul as y t ej i dos19
Bi ol ogía y Geol ogía
3º ESOTej i dos conect i vos ( I I ) . Tej i dos car t i l agi noso y óseo
Tejido cartilaginoso
Tejido óseoTejido óseo compacto
Tejido óseo esponjoso
Condrocitos
Matriz cartilaginosa
Pericondrio
Slide 1 HyalineHyaline cartilage is distinguished by its homogenous matrix surrounding the small nests of chrondrocytes. Notice the
perichondrium which surrounds hyaline cartilage. Bar = 250 Microns
Expanded View
Slide 5 Haversian CanalA higher magnification view of slide 4 clearly shows the concentric circles. After osteoclasts remove old bone, osteoblasts deposit bone in this circular arrangement beginning with the outer ring and working inward. As the osteoblasts become trapped in their
own calcified deposits, they are known as osteocytes. Bar = 100 Microns
Expanded View
1 Cél ul as y t ej i dos20
Bi ol ogía y Geol ogía
3º ESOTej i dos conect i vos ( I I I ) . La sangr e
Glóbulos blancos o leucocitos
Defienden al organismo de cualquier agente causante de
enfermedad.
Su función es transportar sustancias.
Intervienen en la coagulación de la sangre.
Transportan oxígeno y dióxido de carbono.
Pueden ser:
Plasma sanguíneo
Glóbulos rojos
Endotelio
Eosinófilos
Monocitos
Linfocitos
Basófilos
Neutrófilos
Plaquetas o trombocitos
Slide 9: Bone MarrowNotice the granules in the cytoplasm of the promyelocytes (yellow). Plasma cells (blue) are commonly seen in
peripheral tissues where they secrete antibodies. Bar = 30
Slide 10: Bone Marrow
Neutrophil (green)metarubricyte (red)rubricyte (yellow)plasma cell (blue)Bar = 30 Microns
Expanded View
Slide 12: Bone Marrow
Eosinophilic metamyelocyte (Red)Neutrophilic myelocyte (yellow)Metarubricytes (Blue)
Bar = 50 Microns
Expanded View
Slide 2: Bone MarrowProrubricyte (blue), Band neutrophil (red), Platelets (yellow), Platelets are cell fragments produced by megakaryocytes. You will
see a few of them on most of the slides. Bar = 30 Microns
Expanded View
1 Cél ul as y t ej i dos21
Bi ol ogía y Geol ogía
3º ESOTej i do muscul ar
Tejido muscular estriado esquelético Tejido muscular estriado cardiaco
Tejido muscular liso
Forma los músculos esqueléticos que se unen a los huesos y permiten el movimiento.
Forma el músculo cardiaco.
Se encuentra en las paredes del tubo digestivo, el útero, la vejiga y los vasos sanguíneos.
Slide 2 Skeletal MuscleAt higher magnification, the striations become visible. I-bands (isotropic) are light while A-bands (anisotropic) are dark. Bar = 30 Microns
Expanded View
Slide 4 Skeletal MuscleIn cross section, skeletal muscle is identified by peripheral nuclei and large amounts of cytoplasm. Bar = 50 Microns
Expanded View
Slide 8 Smooth MuscleLongitudinal smooth muscle is identified by long, thin central nuclei, a more scattered tissue layout, and an absence of striations. Bar = 50 Microns
Expanded View
Slide 14 Cardiac MuscleLongitudinal cardiac muscle can be identified by centrally placed round to oblong nuclei, striations, branching, and intercalated discs (arrow). Bar = 30 Microns
Expanded View
Slide 17 Cardiac MuscleThe arrows mark organelles of the cardiac myocyte. Specific organelles cannot be distinguished. Bar = 30 Microns
Expanded View
1 Cél ul as y t ej i dos22
Bi ol ogía y Geol ogía
3º ESOTej i do ner vi oso
Forma el encéfalo, la médula espinal y los nervios.
Se compone de dos tipos de células: neuronas y células de glía.
NEURONAS
CELULAS DE GLÍA
Axón
Por ejemplo, las células de Schwann que forman
las vainas de mielina.
Vaina de mielina
Axón
Núcleo de la célula de Schwann
Soma
Dendritas
Slide 15 AstrocytesAstrocytes are star-shaped glial cells of the CNS that have long processes. Many of these processes extend to blood vessels where they expand and cover much of the external wall. The expanded endings of the astrocyte processes are known as end-feet. While the blood-brain-barrier is formed by tight junctions between endothelial cells, the end-feet function to induce and maintain the blood-brain barrier. In pathology following stroke the relationship of end-feet to the endothelial cells is altered leading to disruption of the blood-brain barrier and subsequent leakage. Bar = 30 Microns
Expanded View
Slide 7 Dorsal Root GanglionA higher magnification view shows the surrounding satellite cells (red arrows), the glia of the DRG. Bar = 50 Microns
Expanded View
CÉLULA PARENQUIMÁTICA CON FINA PARED, CON
FORMA PRISMÁTICA
CÉLULAS PARENQUIMÁTICAS
PARÉNQUIMA DE LA PATATA
Two
ESTOMA
COLÉNQUIMA BAJO EPIDERMIS
COLÉNQUIMA
ESCLEREIDA
ARBOL DEL ACEITE DE BRASIL
CANALES SECRETORES VISTOS
LONGITUDINAL Y TRANSVERSALMENTE