AP Biology Questions on Epithelial Tissue: Exam Prep

📚 Quick Study Guide

• 🔬 Definition: Epithelial tissue covers body surfaces, lines body cavities and forms glands. Think of it as the body's first line of defense and its secretary!
• 🧱 Cellularity: Epithelial cells are tightly packed together, forming continuous sheets. They're like tiny bricks making a sturdy wall.
• 🤝 Specialized Contacts: Epithelial cells are connected by tight junctions, adherens junctions, desmosomes, and gap junctions. These junctions help maintain the integrity of the tissue and facilitate communication.
• ⚓ Support: All epithelial sheets are supported by a basement membrane, composed of a basal lamina and a reticular lamina. This provides support and anchors the epithelium to underlying connective tissue.
• 🩸 Avascularity: Epithelial tissue is avascular, meaning it contains no blood vessels. Nutrients are received via diffusion from underlying connective tissue.
• 🔄 Regeneration: Epithelial tissue has a high regenerative capacity, allowing it to quickly repair damage. Think of skin cells renewing themselves!
• 💠 Types: Common types include squamous, cuboidal, columnar (each can be simple or stratified), pseudostratified columnar, and transitional.
  • 📏 Squamous: Flat, scale-like cells.
  • 🧊 Cuboidal: Cube-shaped cells.
  • columnar: Column-shaped cells.
  • 🤥 Pseudostratified: Appears stratified but is actually a single layer.
  • 🔄 Transitional: Able to change shape.
• 🧪 Functions: Protection, absorption, filtration, excretion, secretion, and sensory reception. It's quite the multi-tasker!

Practice Quiz

1. Which of the following is NOT a characteristic of epithelial tissue?
   1. A) High regenerative capacity
   2. B) Avascularity
   3. C) Abundant blood vessels
   4. D) Specialized contacts
2. Which type of epithelial tissue is best suited for diffusion and filtration?
   1. A) Stratified squamous
   2. B) Simple cuboidal
   3. C) Simple squamous
   4. D) Transitional
3. What type of cell junction prevents the passage of substances between epithelial cells?
   1. A) Gap junction
   2. B) Desmosome
   3. C) Adherens junction
   4. D) Tight junction
4. Which epithelial tissue is commonly found lining the respiratory tract and contains goblet cells?
   1. A) Simple columnar
   2. B) Stratified squamous
   3. C) Pseudostratified columnar
   4. D) Transitional
5. The basement membrane, which supports epithelial tissue, is composed of which two layers?
   1. A) Apical and basal lamina
   2. B) Basal lamina and reticular lamina
   3. C) Reticular lamina and apical lamina
   4. D) Connective and muscle lamina
6. Which type of epithelial tissue is capable of stretching and changing shape, such as in the bladder?
   1. A) Simple cuboidal
   2. B) Stratified columnar
   3. C) Transitional
   4. D) Simple squamous
7. What is the primary function of goblet cells found in some epithelial tissues?
   1. A) Absorption of nutrients
   2. B) Secretion of mucus
   3. C) Protection from abrasion
   4. D) Sensory reception