Chapter 1 Lesson 2 System Interactions

Ms. Schreurs

7th Grade Life Science

Human Body Systems

How Do You Move? • Skeletal System (skeleton)=

______________________________________________________

• ______________= attached to the bones of your skeleton and provide the force that moves your bones – Muscles can contract and relax

** Muscles and Bones work together to help you move**

“Show Me Your Muscles”

Which muscles are contracted, which are relaxed?

Joints

• Joint= ________________________ ______________________________

Try This!

Stand on one leg with the other bent –Which muscles are you using? Which

are contracted, and which are relaxed?

Which Systems Move the Materials in Your Body?

• The circulatory, respiratory, digestive, and excretory systems play key roles in moving materials in your body

• _________________ - heart, blood vessels,

and blood

Blood Vessel

Respiratory System

• Breathing is controlled automatically by your nervous system

• Muscles cause your chest to ______________________

20,000 Times/day

How do your respiratory and circulatory systems work together?

Digestive System • Helps to break down foods into sugars

and other nutrient molecules that your body can use

• __________=a substance that your body needs to carry out its functions

How do the circulatory system and digestive system work

together? • __________________________________________________________________________________________

Excretory System

• Eliminates _________ from your body

- Kidneys filter blood to produce urine

Which Body Systems Control Body Functions?

• Nervous system – Helps body systems _________________

– Made of the brain, spinal cord, and nerves

– ____________= a signal in your environment that makes you react

– Response= what does in reaction to a stimulus (involve other systems)

Endocrine System

• Produces ____________________

• Glands= release chemical signals into the blood stream (ex. Sweat)

• Hormones= chemical signals released by the endocrine system

Complete in your Textbook:

•Assess Your Understanding,

Pages: 12, 15 & 17

•Apply it! Page 17