1. Unit 2 Research assignment
Cells & Systems
Unit 2
Research assignment

2. Cells and systems inquiry project
You will be responsible to conduct research on a human body system and a disease or disorder of that system.
You will get 2-3 classes to research on your own.
Due date:

3. Assignment Sign-Up Digestive Excretory Nervous Special cases Endocrine
Circulatory
Digestive
Respiratory
Excretory
Nervous
Endocrine
Special cases

4. The Circulatory System
Heart, blood, blood vessels
Circulates blood through the body
Blood contains nutrients, waste, dissolved gas etc.
Why is it essential?

5. The Digestive System
Esophagus, liver, pancreas, stomach, gall bladder, rectum etc.
Breaks down food into nutrients usable by cells.
Expels waste from the body.
Why is it essential?

6. The Respiratory System
Trachea, lungs, diaphragm
Inhaling oxygen and exhaling carbon dioxide
Lungs transport dissolved gases to circulatory system.

7. The Excretory System Kidneys
Filters waste from the circulatory system so it can be excreted from the body.
Why is it essential?

8. The Nervous System

9. Sensory Awareness
Goal: maintain optimal internal environment for the cells
Nervous system: controls the response to stimuli
Stimuli examples: temperature, pain etc.
(skin, nerves, spinal cord)
Endocrine system: produce chemical messages and produce hormones
Hormone examples: Adrenaline, insulin, growth hormone
(glands)

10. How they all work together Example: Circulatory and Respiratory
Cells in the body need to be connected with air.
Respiratory system: exchanges the oxygen and carbon dioxide (dissolved gases).
Circulatory system: transports the dissolved gases.
In the tissue of the lungs, there are alveoli (air sacs) that are surrounded by capillaries (blood vessels). At this point the dissolved gases can pass back and forth.
Oxygen leaves the alveoli and enters the blood vessel to be transported throughout the body.
Carbon dioxide leaves the blood vessels and enters the alveoli to be transported outside the body via the lungs.

11. Alveoli and Capillaries

12. Circulatory System showing oxygenated (blue) and deoxygenated (red) blood