Create a table summarizing surface specializations on epithelia, including examples, locations, and functions. Also, classify glands based on duct systems, providing examples and locations for exocrin

Here are the answers to the questions.

Fill the table below

SURFACE SPECIALISATION ON EPITHELIA	EXAMPLE AND LOCATION	FUNCTION
Cilia	Trachea, fallopian tubes	Propel substances (e.g., mucus, ova) along the epithelial surface
Microvilli	Small intestine, kidney tubules	Increase surface area for absorption and secretion
Keratin	Epidermis of skin	Provide protection against abrasion, water loss, and pathogens
Stereocilia	Epididymis, inner ear (hair cells)	Increase surface area for absorption (epididymis); mechanoreception (ear)

Classify glands using the following criteria and give examples and locations.

1. PRESENCE OR ABSENCE OF A DUCT SYSTEM

• a. Duct system present: Exocrine glands
  • Examples: Salivary glands (mouth), Sweat glands (skin), Pancreas (digestive enzymes)
• b. Duct system absent: Endocrine glands
  • Examples: Thyroid gland (neck), Adrenal glands (above kidneys), Pituitary gland (brain)

2. SHAPE OF SECRETORY END PIECE AND STRUCTURE OF DUCT SYSTEM

• a. Simple Tubular: Straight tube-like secretory portion, unbranched duct.
  • Example: Intestinal glands (crypts of Lieberkühn)
• b. Simple Branched Tubular: Branched secretory portion, unbranched duct.
  • Example: Gastric glands
• c. Simple Alveolar (Acinar): Sac-like secretory portion, unbranched duct.
  • Example: Sebaceous glands
• d. Compound Tubular: Branched duct, tubular secretory portion.
  • Example: Duodenal glands (Brunner's glands)
• e. Compound Alveolar (Acinar): Branched duct, sac-like secretory portion.
  • Example: Mammary glands
• f. Compound Tubuloalveolar (Tubuloacinar): Branched duct, both tubular and sac-like secretory portions.
  • Example: Salivary glands (submandibular, sublingual)

3. MODE OF SECRETION

• a. Merocrine secretion: Secretory products are released by exocytosis, with no loss of cellular material.
  • Examples: Salivary glands, most sweat glands, pancreatic acinar cells.
• b. Apocrine secretion: Secretory products accumulate at the apical surface, which then pinches off, releasing the product along with a small amount of cytoplasm.
  • Examples: Mammary glands (lipid secretion), some sweat glands (axillary, anogenital).
• c. Holocrine secretion: The entire secretory cell ruptures and becomes part of the secretion. The lost cells are replaced by mitotic division of basal cells.
  • Examples: Sebaceous glands of the skin.

4. CHEMICAL NATURE OF THE SECRETION

• a. Serous secretion: Watery fluid rich in enzymes or other proteins.
  • Examples: Parotid salivary gland, pancreatic enzymes.
• b. Mucous secretion: Viscous, glycoprotein-rich fluid (mucus) that lubricates and protects surfaces.
  • Examples: Goblet cells in the respiratory and digestive tracts, sublingual salivary gland.
• c. Mixed (Seromucous) secretion: Contains both serous and mucous components.
  • Examples: Submandibular salivary gland.