body organization ch 22.1 7th

Chapter 22 Section 1

Body Organization

Objectives:

Describe how tissues, organs, and organ systems are related

List 11 organ systems

Identify how organ systems work together to maintain homeostasis

Homeostasis:Definition: the maintenance of a stable

internal environment in the body

http://www.southtexascollege.edu/nilsson/4_GB_Lecture_figs_f/4_GB_16_Homeostasis_Fig_f/Homeostasis_TempControl.GIF

Cells, Tissues, and Organs:

Maintaining homeostasis is not a simple task

Internal environment is always changing

Cells need nutrients and oxygen to survive, wastes need to be removed

If homeostasis is disrupted, cells may die

Cells form Tissues:Each cell in your body has a role in maintaining

homeostasis

Your cells are organized into groups

Tissue: a group of similar cells working together

Your body has 4 main kinds of tissues:EpithelialNervousMuscleConnective

4 Types of Tissue:Epithelial Tissue: covers and protects

underlying tissue; ex: skinNervous Tissue: sends electrical signals

through the body; found in brain, nerves, sense organs

Muscle Tissue: made of cells that contract and relax to produce movement

Connective Tissue: joints, supports, protects, insulates, nourishes, and cushions organs

Tissues:

http://graphics8.nytimes.com/images/2007/08/01/health/adam/8682.jpg

Tissues form Organs:

Two or more tissues working together form organs

Organ: a collection of tissues that carry out a specialized function of the body

Ex: Stomach, heart, lungs, kidneys

Organs Form Systems:

Organs that work together make up an organ system

Your body has 11 major organ systems

How many can you list??

Working Together: Organ Systems11 Major Organ Systems:

Integumentary (skin)Muscular SkeletalCardiovascularRespiratoryUrinaryReproductiveNervousDigestiveLymphaticEndocrine

Highlighting systems:

Cardiovascular system:Heart, blood vessels,

blood

Respiratory system:lungs

Both systems work together

Quick Quiz:

True or False?Epithelial tissue sends electrical signals

throughout the body

Blood is a type of connective tissue

Homeostasis is the maintenance of a stable internal environment