Chapter 1 Lesson 3 Homeostasisas253.k12.sd.us/7th Homework Documents/Human Body...Chapter 1 Lesson 3...
Transcript of Chapter 1 Lesson 3 Homeostasisas253.k12.sd.us/7th Homework Documents/Human Body...Chapter 1 Lesson 3...
Chapter 1 Lesson 3 Homeostasis
Ms. Schreurs
7th Grade Life Science
Human Body Systems
My Planet Diary
Worried Sick- Not Just an Expression
Page 18
How Does Your Body Stay in Balance?
• Conditions inside your body stay stable – Examples:
1. Chemical makeup of your cells
2. Water content
3. _________________
Homeostasis
= condition in which an organism’s internal environment is kept stable in spite of changes in the _______________
• All of your body systems working together maintain ______________ and keep the body in balance
Maintaining Homeostasis
• Regulating Temperature
– Changes to the amount of blood flow to skin also regulates ___________________
Meeting Energy Needs
• Hormones from the endocrine system signal the nervous system to make you feel hungry when you need energy
• Figure 2 page 20
Maintaining Water Balance
• Water you drink passes from digestive system to ____________________
• Excess water leaves body through your excretory system (exhale, sweat,
urinate)
Keeping Your Balance • Your ears help you balance
– Structures in your inner ear sense the _______________________
– Brain sends signals to your muscles when you are loosing your _______
Responding to Stress • __________= the reaction of your
body to possibly threatening, challenging, or uncomfortable events – Examples: heart beating fast, faster
breathing – Ongoing stress can disrupt
________________ • Example: your body many not
be able to fight disease as well
Fighting Disease
• Bacteria and viruses that cause disease can disrupt homeostasis and make you
sick
• Immune System=_________________ ______________________________ – Fighting infection causes
increased body temp, uses extra energy
Systems in Action
• Real-World Inquiry
Page 24-25
• Assess Your Understanding Page 25