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Tissue: Structure and Function
Chapter 27.2
Tissue
A group of cells and cell
products of similar structure
that perform a common
function
Histology
The study of tissues,
especially their structure
and arrangement
Basic Tissue Types
 Epithelial
 Connective
 Muscle
 Nervous
Organ
A group of tissues
organized into a functional
unit
System
Organs working together
as functional units
Epithelial Tissue
Sheet-like layer of cells
 Cover surfaces or line cavities
 Often has glandular cells for fluid
secretion
 Endothelium
 Epithelium that lines heart, blood
vessels and lymphatic vessels

Epithelial Types

Simple Epithelium

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

Simple squamous – inside blood vessels
Simple cuboidal – lines ducts, ex. Kidney
tubules, mucus glands
Simple columnar – lining of small intestine
Pseudostratified Columnar – trachea, bronchi
Figure 09.9a
Figure 09.9b
Pseudostratified Columnar
Epithelial Types
 Stratified
Epithelium
 Stratified squamous - skin
 Transitional – urinary tract and
bladder

Tissue that connects-CONNECTIVE
 Loose CT
adipose (fat)
 Dense CT
Cartilage, Bone
 Vascular tissue-Blood
Erythrocytes: RBC– carry O2
Leukocytes: WBC– part of the immune
system
Platelets - clotting
Adipose (fat)
Figure 09.11c
Figure 09.11d
Erythrocytes:
Red Blood Cells
Leucocytes: White Blood Cells
Platelets
Nervous Tissue

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Includes Nerves, Spinal Cord, Brain
Nerve cells are called neurons
Function: to send signals throughout the body.
Neuron
Muscle Tissue Types

Smooth Muscle-Found in most organs
(=Involuntary Muscle)

Ex. Small intestine
Skeletal Muscle-Attached to the bones
 (=Voluntary Muscle)
Ex. Large muscles of body
 Cardiac Muscle –Heart
pumps blood, part of it dies
if you have a heart attack.

Homeostasis: Balance (27.3)