- PEMBELAJARAN 2011 - 2012
- PRAKTEK : BIOLOGI KELAS XI IPA
- MATERI : MEMBUAT PREPARAT SEL - JARINGAN TANAMAN - ORGAN
- WAKTU : 90 MENIT
- BAHAN : BAWA DARI RUMAH - DISEDIAKAN
- REFRENSI : BAB SEL DAN JARINGAN TANAMAN
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Anatomy of a cell -- 3 main parts:
- plasma membrane
- cytoplasm
- nucleus.
- Plasma membrane
- Cytoplasm -- 2 main parts:
- Cytosol
- Organelles: beginning with those that are membrane-bound:
- Endoplasmic reticulum (ER)
- Rough ER
- Smooth ER
- Golgi body
- Lysosomes
- Mitochondria
- Cytoskeleton -- not membrane-bound. Three parts:
- Microtubules
- Microfilaments
- Intermediate filaments
- Nucleus
- Specialized cell contacts (cell junctions)
- Tight junctions
- Desmosomes
- Gap junctions
TISSUES
Histology = the study of tissues
Epithelium
Definition of epithelium: Tissue that:
Histology = the study of tissues
Epithelium
Definition of epithelium: Tissue that:
- covers or lines surfaces and cavities of the body, or
- forms glands (= secretory structures)
General characteristics
- Cellularity: composed almost entirely of cells
- Make specialized contacts
- Display polarity (sidedness)
- Basement membrane (anchors epithelium to the underlying connective tissue)
- Ability to regenerate quickly
- Avascular (no blood vessels)
c. Function
- Absorption
- Secretion and Excretion
- Diffusion and Filtration
- Propulsion
- Protection
Classification
- By layering: simple or stratified
- By shape: squamous, cuboidal, or columnar
A. Simple epithelium
- Simple squamous -- thinnest kind
- Simple cuboidal
- Simple columnar Can be further modified: -Microvilli -Goblet cells -Cilia
- Pseudostratified columnar
B. Stratified epithelium
- 1. Stratified squamous -- thickest
- 2. Stratified cuboidal -- rare
- 3. Stratified columnar -- very rare
- 4. Transitional (changes shape)
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