Epithelium

Question 1

PARENCHYMA

Answer 1

Secretory portion of glands

Question 2

Endothelium

Answer 2

• Simple squamous epithelial lining
• Lines blood and lymphatic vessels
• Sometimes called the vascular epithelium because of it’s location between the blood and tissue

Question 3

Endocardium

Answer 3

Epithelial lining of ventricles and atria of the heart

Question 4

Mesothelioma

Answer 4

Epithelium that lines the walls and covers the contents of the closed cavities of the body ( i.e the abdominal, pericardial, and pleural cavities)

Question 5

Junctional complexes

Answer 5

Formed in the apical parts of epithelial cells

• Responsible for tight cell adhesions, but also allow epithelial to regulate paracellular movements of solutes down their electroosmotic gradients
• Junctional complexes separate the apical plasma membrane domain from basal and lateral domains and allows them to specialize and recognize different molecular signals

Question 6

Microvilli

Answer 6

Finger-like Cytoplasmic projections on the apical surface of most epithelial cells.

• contain a core of actin filaments
• Found in intestines and kidney tubules- areas where there is a lot of absorption going on.

Question 7

Stereocilia ( stereovilli)

Answer 7

Microvilli of unusual length

• immobile microvilli
• also supported by internal bundles of actin filaments
• not widely distributed. They are found in:
• epididymis
• ductus deferents
• sensory ( hair) cells of the inner ear

Question 8

Cilia

Answer 8

Hair-like extensions of the apical plasma membrane containing an axoneme, the microtubule-based internal structure

*Cytoplasmic processes containing a bundle of microtubules

Question 9

Types of Cilia

Answer 9

-Motile
9+2 pattern of microtubules

• Primary (non-motile) -chemosensors, osmosensors, and mechanosensors. Have a 9+0 pattern of microtubules. Present in stem cells,uterus,kidney tubules,photoreceptors cells in the retina
• Nodal-found in the embryo on the bilaminar embryonic disc at the time of gastric action