Topic: Homeostasis
Aim: How are humans
adapted to maintain
homeostasis?
Do Now:
1.) Define homeostasis
2.) List the levels of organization in
multicellular organisms (from
smallest to largest unit)
Homework:
Read and outline Textbook pages
512-523
Homeostasis
 Constant Balance, Steady State or
Dynamic Equilibrium
 Ability of an organism to “maintains it’s internal
environment while responding to external
environmental factors
 Temp increase or decrease
LEVELS OF ORGANIZATION
in multicellular organisms
 CELLTISSUE ORGAN  ORGAN SYSTEM
ORGANISM
Complex organisms like humans
have developed a number
of systems to ensure
• Genetic diversity
• Maintain homeostasis
• Perform other essential
life functions
•Contains lungs,
kidneys and sweat
glands
•Eliminates
metabolic waste
products
FAILURE OF
HOMEOSTASIS
•
Urinary Tract Infection
•
Kidney stones
Kidney health
• Control blood glucose
level
• Control blood
pressure
How does the Excretory System
work with another system?
?
• Contains the heart, blood vessels
and blood
•Involved in transport of material
throughout the body:
• Digested
food
• Oxygen
• Hormones (chemical
messengers)
• Antibodies
• Waste.
Failure of Homeostasis
• Coronary artery
disease
Acquired/life style
• Heart murmur
(can be present at
birth)
Heart Health
How does the Circulatory System
work with another system?
?
•Includes: mouth,
esophagus, stomach,
small intestine, large
intestine, rectum, anus.
•Food is broken down
mechanically and
chemically from
complex into simple
molecules
•Undigested food is
eliminated as waste
Failure of Homeostasis
• Heart
burn
•Crohn's disease
•(inflammation of the digestive system)
Healthy Digestive System
You can help your digestive system by:
 drinking water
 eating a healthy diet
How does the Digestive System
work with another system?
?
•Includes mouth, nose and lungs
• Exchange of gases
Failure of homeostasis
• Asthma
• Emphysema
How does the Respiratory System
work with another system?
?
Skeletal
•Includes bones, cartilage,
ligaments, muscles and
tendons
•Bones marrow is the site for
red blood cell production
Muscular
•Includes 3 different types of
muscle: skeletal, smooth
and cardiac
Provides movement,
support and protection
FAILURE OF
HOMEOSTASIS
SPRAIN
over stretching of
tendons or ligaments
Tendonitis
Inflammation of
tendons
How does the
Skeletal and Muscular System
work with each other?
?
Endocrine
system
includes glands
Release hormones
Nervous system
includes brain,
spinal cord and
nerves
Sends messages
Regulates body activities
FAILURE
OF HOMEOSTASIS
Endocrine System:
•
•
Stress
Diabetes
Nervous Systems
•
•
Alzheimer's disease
Stroke
How does the
Endocrine and Nervous Systems
work with other systems?
?
Final Summary:
How are humans adapted
to maintain homeostasis?