1. HOW BODY SYSTEMS WORK TOGETHER

2. The Digestive System Mechanical digestion
Breaks food down into smaller particles so the body
can absorb the food’s nutrients
There are two types of digestion
Mechanical
Chemical
Mechanical digestion
Food is broken into smaller pieces
Ex: Teeth grinding/chewing
Stomach churning/squeezing food

3. Enzymes break the chemical bonds between molecules of food
Chemical Digestion
Enzymes break the chemical bonds between molecules of food
Chemical digestion begins in the mouth
Saliva contains enzymes
Complex carbohydrates (bread, potato,etc.) are broken into simple sugars
Chemical digestion also happens in the stomach and small intestine
Acids break molecules of food into smaller and smaller molecules until molecules are small enough to move out of the small intestine and
into the blood stream
Blood cells then carry nutrients
to all the cells of the body

4. Circulatory System What does blood carry?
Transportation system of body
What does blood carry?
Nutrients (proteins, glucose) to each cell of body from digestive system
Oxygen from lungs to each cell (used in cellular respiration)
Carbon dioxide (end product of cellular respiration) from cells back to lungs
Takes waste products to kidneys
Also carries white blood cells to help fight bacteria

5. Respiratory System – brings in oxygen, exhales carbon dioxide
Inhaled oxygen rich air travels from the nose, through the trachea to the lungs. The lungs are filled with tiny, thin-walled sacs called alveoli
The oxygen diffuses through the thin wall of the alveoli into tiny capillaries surrounding each alveoli and into blood cells
Blood cells then carry oxygen to every
cell in body for cellular respiration
Carbon dioxide is then carried by blood cells back to lungs to exhale

6. The reason for any type of movement in the body such as:
Muscular System
The reason for any type of movement in the body such as:
Blinking your eyes
Heart beating
Running
Food moving through digestive system
Blood vessels moving blood through body
Diaphragm muscle contracting and relaxing which controls breathing
Contractions of stomach

7. Nervous system
Made of special cells called neurons (nerve cells), spinal cord, and brain
Neurons receive messages and send directions throughout the body
All tissues and organs require directions from the nervous system on how to work/what to do
Controls muscle movement, both voluntary (lifting your arm, running) and involuntary (heart beating, breathing)
Includes sense organs which pick up information from the environment (sound, heat, cold, light, smell, etc)

8. Skeletal System Supports the body Protects soft organs
(ribs protect lungs and heart)
(skull protects brain)
Makes red and white blood cells
Attachment for muscles and organs
Muscles contract and move bone

9. How do the body systems work together???
Soooo……
How do the body systems work together???