Chapter 1: Bones and Muscles Science P4 Harapan Prestasi Primary School By : Florita Mella Rosalia Lessons: A B C Bones and the Skeleton Muscles and Movement Animals and Skeletons Group Work: 1. How many bones are there in rib cage? 2. What is the longest bone in human skeleton? 3. Look at the chart : Answer Group Work: 1. How many bones are there in rib cage? 24 bones 2. What is the longest bone in human skeleton? femur 3. Look at the chart : Yasmin Luisa Josie When someone is getting older, the bones are longer. Student’s Book pg. 12-15 B Muscles and Movement • Describe how muscles help bones move • Describe the importance of movement in maintaining human health. How do muscles work? • Bones cannot move by themselves. They need muscles to move. • Some our muscles are joined to the bones. These muscles are skeletal muscles. • Muscles work in pairs to make the bones move. Watch the video: https://drive.google.com/file/d/1xyUNh5o6eMGAo6FvXBOkghXI0Co6IRR8/view?usp=sharing How do muscles work? When our biceps contract When our triceps contract or or shorten, they pull up the shorten, they pull down the bone in our lower arm. This bone in our lower arm. This allows our arm to bend. allows our arm to straighten. What can you do to be healthy?
