4  Chapter 4

4.1 Histology / Tissues

4.2 Introduction

In this lab, the four basic tissue types of the human body are examined using diagrams and microscopy. Emphasis is placed on recognizing tissue structure, function, and location.

4.3 Objectives

  • Identify epithelial, connective, muscle, and nervous tissues

  • Explain how structure supports tissue function

  • Identify tissues and associated structures on histology slides

4.4 Prelab Activity 4.1

4.4.1 Types of Tissues

  • Epithelial: Covers surfaces, lines cavities, forms glands

  • Connective: Supports, binds, and protects tissues

  • Muscular: Contracts to produce movement

  • Nervous: Transmits electrical signals

4.4.2 Epithelial Tissues

  • Simple squamous: Thin, flat cells for diffusion and filtration

  • Stratified squamous (keratinized/nonkeratinized): Protection from abrasion

  • Simple cuboidal: Absorption and secretion

  • Stratified cuboidal/columnar: Protection and secretion (rare)

  • Simple columnar: Absorption and secretion

  • Pseudostratified columnar: Mucus secretion and movement

  • Transitional epithelium: Allows stretching in urinary organs

4.4.3 Epithelial Features

  • Simple: One cell layer

  • Stratified: Multiple cell layers

  • Apical surface: Faces a free space or lumen

  • Basal surface: Anchored to connective tissue

  • Basement membrane: Connects epithelium to connective tissue

4.4.4 Connective Tissue

  • Cartilage: Flexible supportive tissue

  • Areolar connective tissue: Loose binding tissue

  • Hyaline cartilage: Smooth support

  • Adipose tissue: Fat storage and insulation

  • Fibrocartilage: Shock absorption

  • Elastic cartilage: Flexible support

  • Regular dense connective tissue: Parallel collagen fibers

  • Irregular dense connective tissue: Interwoven collagen fibers

  • Bone: Rigid support and mineral storage

  • Blood: Transport of gases, nutrients, wastes

4.4.5 Connective Tissue Features

  • Collagen fibers: Strength

  • Elastin fibers: Elasticity

  • Extracellular matrix: Structural support

  • Fibroblasts: Fiber production

  • Adipocytes: Fat storage

  • Chondrocytes: Cartilage cells

  • Lacuna: Space housing cells

4.5 Lab Activity 4.1 – Epithelial Tissue Identification

Figure Tissue Location Function
4.3 Simple squamous Alveoli Diffusion
4.4 Simple cuboidal Kidney tubules Secretion
4.5 Simple columnar Small intestine Absorption
4.6 Transitional Urinary bladder Stretching
4.7 Stratified squamous Epidermis Protection
4.8 Pseudostratified columnar Trachea Mucus movement

4.6 Lab Activity 4.2 – Microscope Work (Epithelial)

Tissue Magnification Location
Simple squamous 400× Lungs
Simple cuboidal 400× Kidneys
Simple columnar 400× Intestine
Transitional 400× Bladder
Stratified squamous 400× Skin

4.7 Lab Activity 4.3 – Connective Tissues

Tissue Location
Areolar Beneath epithelia
Adipose Hypodermis
Dense regular Tendons
Blood Vessels
Hyaline cartilage Trachea
Fibrocartilage Intervertebral discs
Elastic cartilage External ear
Bone Skeleton

4.8 Post Lab Activity 4.1

  • Epithelium is classified by cell shape and number of layers

  • The four tissue types are epithelial, connective, muscular, nervous

  • Epithelial tissue contains an apical surface

4.9 Post Lab Activity 4.2 – Identification

  • Fig. 4.10: Simple squamous – Alveoli

  • Fig. 4.11: Simple cuboidal – Kidney

  • Fig. 4.12: Simple columnar – Intestine

  • Fig. 4.13: Transitional – Bladder

  • Fig. 4.14: Stratified squamous – Epidermis

  • Fig. 4.15: Pseudostratified columnar – Trachea

4.10 Post Lab Activity 4.3 – Crossword Answers

4.10.1 Across

  • 4 Simple squamous epithelium

  • 5 Neuron

  • 7 Glial cell

  • 9 Stratified squamous epithelium

  • 11 Simple cuboidal epithelium

  • 12 Skeletal muscle

4.10.2 Down

  • 1 Dense regular connective tissue

  • 2 Loose connective tissue

  • 3 Bone

  • 6 Hyaline cartilage

  • 8 Cardiac muscle

  • 10 Smooth muscle

✅ End of Chapter 4