1. Notes: Life processes and
Homeostasis (pg 4)

2. Baby Girl!

3. Life processes
1. Maintaining boundaries
a. Every cell is surrounded by a membrane
b. The body is surrounded by skin

4. Life processes
1. Maintaining boundaries
a. Every cell is surrounded by a membrane
b. The body is surrounded by skin
2. Metabolism: Chemical reactions within body cells
a. Catabolism: Destructive. Food → Nutrients
b. Anabolism: Constructive. Nutrients → Muscle

5. Life processes
1.Boundaries
2. Metabolism
a. Catabolism: Destructive. Food → Nutrients
b. Anabolism: Constructive. Nutrients → Muscle
3. Responsiveness (Irritability): Ability to respond to a
stimulus

6. Life processes
1. Boundaries
2. Metabolism
a. Catabolism: Destructive. Food → Nutrients
b. Anabolism: Constructive. Nutrients → Muscle
3. Responsiveness (Irritability): Ability to respond to a
stimulus
4. Movement: Includes movement of the whole body
(walking, running), parts of the body, and
movement within the body (blood flowing through
blood vessels, food through the digestive system,
etc.)

7. Life processes
1. Boundaries
2. Metabolism
3. Responsiveness (Irritability): Ability to respond to a
stimulus
4. Movement: Includes movement of the whole body
(walking, running), parts of the body, and
movement within the body (blood flowing through
blood vessels, food through the digestive system,
etc.)
5. Reproduction:
a. Cellular level- for growth and repair and
replacement of old cells.
b. Organism level-formation of a new individual

8. Life processes
6. Growth: Increase in size either through increased #
of cells or size of cells

9. Life processes
6. Growth: Increase in size either through increased #
of cells or size of cells
7. Differentiation: Unspecialized cells develop into
specialized cells with distinctive structural and
functional characteristics

10. Life processes
6. Growth: Increase in size either through increased #
of cells or size of cells
7. Differentiation: Unspecialized cells develop into
specialized cells with distinctive structural and
functional characteristics
8. Respiration:
Cellular- breakdown of sugar into CO2 using O2
Organism- exchange of CO2and O2 in lungs

11. Life processes
6. Growth: Increase in size either through increased #
of cells or size of cells
7. Differentiation: Unspecialized cells develop into
specialized cells with distinctive structural and
functional characteristics
8. Respiration:
Cellular- breakdown of sugar into CO2 using O2
Organism- exchange of CO2and O2in lungs
9. Digestion: Breaking down food into nutrients
usable by the body

12. Life processes
6. Growth: Increase in size either through increased #
of cells or size of cells
7. Differentiation: Unspecialized cells develop into
specialized cells with distinctive structural and
functional characteristics
8. Respiration:
Cellular- breakdown of sugar into CO2 using O2
Organism- exchange of CO2 and O2
9. Digestion: Breaking down food into nutrients
usable by the body
10. Excretion: Removal of non-usable waste and by-
products of metabolism

13. Output (pg 5)
• Design an alien

14. Homeostasis (pg 4)
• Constant internal environment that must be
maintained in the body
• Usually accomplished by negative feedback

15. Example: Thermostat

16. Body Temperature

17. Positive Feedback
• Occurs when the output of a system
stimulates further increase in output
• Does not maintain homeostasis