3.2.11 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.
Muscular System Function: Produces the force and energy needed to put the body in motion
DON’T BLINK Keep your eyes open for as long as you can without blinking
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.
Working in pairs Muscles on either side of the bone contract or relax to create movement
Tendons are connective tissue that hold muscles to bones. Tendons, muscles and bones work like levers.
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 _________
Data Table Trials Left hand Right hand 1 2 3 4 5
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
Line Graph your data Title Labels on x and y axis Scale Key
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?
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
3.3.11 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.
Use your lab sheet Follow the directions on your lab sheet. Answer the “patient chart” in complete sentences in your journal
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