1. Journal 4-6: Regulating the Internal Environment

2. An Example of Homeostasis
Human body cells
require O2
Nutrients
produces
CO2
Wastes
The circulatory system, respiratory system, urinary system and digestive system all work together to maintain an internal balance.

3. Respiratory system Lungs - gas exchange External Internal
Environment blood
(air) O2
CO2
Mouth/nose --> pharynx --> trachea --> bronchi --> bronchioles --> alveoli*
*where diffusion of gases takes place

4. Digestive System (Review)
Small intestine – absorbs nutrients
What diffuses from villi into bloodstream?
Monomers of nutrients (carb/ lipid/ protein)

5. Urinary System Kidney - removes wastes from the blood
Nephron – basic working unit of kidney:
Filtration - removes waste
Absorption - takes back good things
Secretion - removes extra waste
Concentration - removes extra H2O
Kidney -> ureter --> bladder --> urethra

7. You don’t need to write this down!
Hormone effects
You don’t need to write this down!
Think back to “Can you stand the heat?”
What makes you dehydrated?
What are some actions you can take to help?
Also, the brain and adrenal glands will help you retain H2O
Brain  antidiuretic hormone (ADH)
Adrenal glands  aldosterone

8. Circulatory system
Transports materials throughout the body
To the body cells…
Oxygen
Nutrients
From the body cells…
Wastes
Carbon dioxide
Turn to a partner: for each material, where is it coming from and to?
Where is diffusion taking place (be specific)?

9. Heart Moves blood through the body Valves prevent backflow Right side
Deoxygenated blood
Pumps blood to the lungs
Left side
Oxygenated blood
Pumps blood to the body
Heart

10. Heart
BODY  Vena cava  Rt Atrium  Rt Ventricle  Pulmonary arteries  LUNGS  Pulmonary veins  Lf Atrium  Lf Ventricle  Aorta  BODY

11. Veins, Arteries and Capillaries
Arteries - carry blood away from the heart
Veins - carry blood toward the heart.
Capillaries - tiny blood vessels
Location of diffusion of…..
Oxygen, Carbon dioxide
Nutrients
Wastes
Turn to your partner – which system is responsible for the above?

12. Journal 4-6 Part 2: Body System Jigsaw
Sharing Group 1
Sharing Group 2
Sharing Group 3
Sharing Group 4
Brain Group
Olivia
Suzanna
Yarden
Ethan
Jessica
Muscle Group
Oliver
Alana
Mike
Becca
Kidney Group
Marina
Patrick
Emma
Ashley
Jack
Small Intestine Group
Mei
Charles
Liam
Shanice
Clara