Human Body Systems

Homeostasis – Maintain a stable internal
environment.

Examples: temperature, breathing and blood
pressure
Four types of tissues

Tissue is made up of a group of similar
cells that work together.

Epithelial - covers and protects underlying
tissue. Ex. skin
 Nervous – sends electrical signals throughout
the body. Found in the brain, nerves and
sense organs.
 Muscle – cells that contract and relax to
produce movement.
 Connective – joins, supports, protects,
insulates, nourishes and cushions organs.
Cell Organization
Tissues are made up of a group of cells
that work together.
 Organs are formed by two or more tissues
working together.
 Organ systems are formed by two or
more organs working together.

Organ Systems
1. Skeletal System
A framework that
supports and protects
body parts.
2. Muscular System
Allows for movement of
body parts.
Organ Systems
3. Circulatory System
Transports materials
throughout the body in
the blood.
4. Respiratory System
Exchanges gases in
the lungs.
Organ Systems
5. Digestive System
Breaks down food into
nutrients for the body.
6. Excretory System
Removes wastes
from the body.
Organ Systems
7. Nervous System
Controls activities
using electrical signals.
8. Endocrine System
Regulates body
functions using
chemical signals.
Skeletal
Muscular
Digestive
Respiratory
Nervous Sensory Endocrine
Circulatory
Urinary
April 21st
1. Write down homework:
• Page 9-5 in packet
• Study flashcards for 8 body systems.
• Quiz Thursday!
2. Get out your homework to be checked.
3. Think about what you know about the skeletal
and muscular systems.
Digestive
Respiratory
Circulatory
Excretory
Skeletal
Muscular
Nervous
System
System
System
System
System
System
System
Integumentary System

What does the Integumentary system do?
 Protects
 Helps

you from the outside world
maintain a healthy internal environment.
What makes up the Integumentary System?
 Skin
 Hair
 Nails
Integumentary System

What are the four important things that
skin does?
– keeps moisture in and keeps foreign
particles out
 Protects
 Allows
you to feel surroundings with nerves
 Controls
body temperature by producing sweat in
sweat glands.
 Removes
wastes in sweat.
Integumentary System

What determines your skin color?
 The

amount of melanin, a chemical, in your skin
What are the two main layers of skin?
 Epidermis
 Dermis

What does the epidermis do?
 Thin
layer, on top
 Made up of epithelial tissue
 Many layers, thin, mostly dead cells
 Keratin makes skin tough
Integumentary System

What does the dermis do?
 Thick
layer, deeper down, underneath epidermis
 Connective
tissue and collagen that provide strength and
flexibility
 Nerves,
blood vessels, sweat and oil glands, muscle fibers &
hair follicles are found here.

How does hair grow?
 New
cells
cells grow at the hair follicle and push out old dead
Integumentary System

What does hair do?
 Protects
from UV light and foreign particles
 Controls body temperature

What do nails do?
 Protects
tips of fingers and toes to allow for feeling
(sense of touch).