1. Muscular system
We will learn about the muscular system by taking notes and doing a mini lab
TEK 7.12B
Warm up: draw the diagram describe the type of energy at each point.

2. Muscular System
Function: Produces the force and energy needed to put the body in motion

3. DON’T BLINK
Keep your eyes open for as long as you can without blinking

4. Voluntary muscles: are the skeletal muscles you can control
Involuntary muscles: muscles not under your controls, typically cardiac and smooth muscle
Skeletal (striated) muscles: are attached to your skeleton
Cardiac muscle is found in the heart
Smooth muscle: lines the digestive tract and the blood vessels.

6. Working in pairs
Muscles on either side of the bone contract or relax to create movement

7. Tendons are connective tissue that hold muscles to bones.
Tendons, muscles and bones work like levers.

8. Muscle Fatigue Lab
Problem: Does my left or right hand have more muscle endurance (strength over time)
Research: Muscles need lots of energy. Muscle cells make energy by combining nutrients with oxygen. If it doesn’t get enough oxygen it creates lactic acid (fermentation). Frequent exercise increase endurance.
Hypothesis: If I exercise both hands then ___________ because _________

9. Data Table
Trials
Left hand
Right hand 1 2 3 4 5

10. Procedures:
Count the number of times you can squeeze a clothespin using your left index finger for one minute
Time your trials and record the results
Rest 10 seconds and repeat this 4 times more
Repeat this test with your right thumb and right index finger. Record in the data table
Construct a line graph using information from the data table

11. Line Graph your data
Title
Labels on x and y axis
Scale
Key

12. Analyze/ conclusion
Name one source of error in this investigation that could have affected your results.
If your hands get sore, what process are the muscles in your fingers using to continue the work of opening and closing the clothespin?
Look at your graph what is happeneing to the number of clothespins opening and shutting over time?
Which hand showed the greatest sign of fatigue?

13. Recall: Muscles are responsible for movement
Summary: What are the three types of muscles and where are they found
OUT: Name the major organs of the muscular system

14. Building an Arm
We will create a model arm to show how the skeletal and muscular systems work together.
TEK 7.12 B
Warm up: What type of machine is this. Identify its parts.

15. Use your lab sheet Follow the directions on your lab sheet.
Answer the “patient chart” in complete sentences in your journal

16. Recall: All systems work together
Summary: Explain the limitations of your arm model.
Out: Vocabulary you should know for your quiz tomorrow:
Bone
Ligament
Invertebrate
Exoskeleton
Involuntary muscle
Cardiac
Tendons
Joint
Vertebrate
Endoskeleton
Voluntary muscle
Skeletal muscle
Smooth muscle
Lever