1. Life Functions & Survival Needs
Chapter 1: Human Biology

2. Maintain Boundaries Cells Surrounded by membrane
that allows necessary materials in
restricts damaging and unnecessary substances

3. Integumentary System Skin protects: Organs from drying out
Bacteria from entering body
From heat, sunlight and chemicals in environment

4. Movement Muscular system Pump blood Move food through body
Move skeleton
Remove waste

5. Responsiveness Sense changes (stimuli) in environment
then react to them
Nerves and Reflexes

6. Digestion Break down food Molecules absorbed into blood and
transported to cells

7. Metabolism Cellular respiration
Convert oxygen and nutrients into ATP(energy)

8. Excretion Remove wastes from body Digestive system produces feces
Urinary system disposes of urine
Skin produces sweat

9. Reproduction Reproductive system: Cell reproduction Produce offspring
Mitosis: dividing one cell into two

10. Growth
Increase in size
Increase in number of cells

11. Homeostasis Body’s ability to maintain constant internal environment
What are some examples of homeostasis in our body?

12. How we maintain homeostasis…

13. Negative Feedback Response by shutting off the original stimulus
Examples:
Increase in body temperature
Blood pressure
Breathing rate
Heart rate
Blood sugar

14. Positive Feedback Feedback that increases the stimulus Examples: Birth
Blood clotting