EBRO-SCIENCE4-Q2-W1-DAY1 (MUSCULAR SYSTEM) PDF

WELCOME TO SCIENCE CLASS  “FLEX AND FREEZE” How did your body feel while doing the exercises? Which parts of your body felt tired or stretched? What do you think helps you move and do these exercises? The Muscular System LEARNING OBJECTIVES Identify the major muscles in the human...

WELCOME TO SCIENCE CLASS  “FLEX AND FREEZE” How did your body feel while doing the exercises? Which parts of your body felt tired or stretched? What do you think helps you move and do these exercises? The Muscular System LEARNING OBJECTIVES Identify the major muscles in the human body and their functions. Describe in simple terms how the muscular system works. Perform physical exercises that show how muscles contract and relax. Appreciate the importance of maintaining a healthy muscular system through regular exercise and proper nutrition.  What is the muscular system? It is an organ system in the body.  What is the muscular system? Its role is to help the body to move, maintain posture and circulate blood through the body.  Muscle types Involuntary muscles are muscles which are not under our conscious control. Voluntary muscles are muscles which are under our conscious control, so we can move these muscles when we choose to. TYPES OF MUSCLES Skeletal Muscles Cardiac Muscles Smooth Muscles  Muscle types 1. Smooth muscle – These muscles are found in internal organs like the stomach and intestines.  Muscle types 1. Smooth muscle – They are involuntary muscles, meaning they work on their own without your control.  Muscle types 2. Cardiac muscle – an involuntary muscle found only in the heart.  Muscle types 2. Cardiac muscle – It is responsible for pumping blood throughout the body.  Muscle types 3. Skeletal muscle – These muscles are attached to bones and help in body movements.  Muscle types 3. Skeletal muscle – They are voluntary muscles, meaning you control them.  Types of muscle contraction Isotonic Contractions - this includes concentric contraction, where the muscle shortens and fattens, as well as eccentric contraction where the muscle lengthens and flattens.  Types of muscle contraction Isometric Contraction – this involves a muscle staying the same length despite building tension. This occurs when the body remains in one position.  Antagonistic pairs are pairs of muscles which work together by one contracting (shortening) and one relaxing (lengthening). The contracting muscle is an agonist and the relaxing muscle is an antagonist. FUNCTIONS OF THE MUSCULAR SYSTEM Movement Skeletal muscles collaborate with the skeletal system to generate voluntary movements. Posture and Stability Muscles aid in sustaining posture and stabilizing joints. Digestion Smooth muscles in the digestive tract facilitate the movement of food through the digestive system FUNCTIONS OF THE MUSCULAR SYSTEM Heat Production Muscle contractions generate heat, crucial for regulating body temperature Respiration The diaphragm and intercostal muscles are pivotal for breathing. Circulation Cardiac muscles propel blood, while smooth muscles in blood vessels regulate blood flow and pressure.  HOW DO MUSCLES WORK? Movement Relaxation Excitement Action The contraction Following Signals from Muscles respond of muscles contraction, your brain by contracting applies force on muscles relax to prompt muscle upon receiving bones, leading to prepare for the activation. the signals. movement. next action.  MAKE A CONCEPT MAP THAT WILL SHOW THE RELATIONSHIPS BETWEEN DIFFERENT ASPECTS OF THE MUSCULAR SYSTEM The Muscular System