Body systems work together like a team to help us move. This teamwork involves our muscles, joints, nerves, and heart. Let’s break it down:
Muscles: We have over 600 muscles in our body. These muscles help us move by getting shorter and tighter, which is called contracting. For example, when you lift your arm, your biceps and triceps pull against each other. One helps bend your elbow, and the other helps straighten it.
Joints: Adults have about 360 joints. Joints are where two bones meet, and they help our body move in different ways. Some joints, like the knee, only allow movement in one direction. These are called hinge joints. Others, like the shoulder, let us move in many directions. These are called ball-and-socket joints.
Nervous System: Our brain sends signals to our muscles super fast—up to 120 meters per second! This quick messaging helps us move smoothly and stay coordinated.
Cardiovascular System: When we exercise, our heart beats faster—sometimes by more than 100 beats per minute. This helps deliver oxygen to our muscles so they can keep working.
All these systems work together so we can do things like run, jump, and throw. This teamwork is important for both sports and everyday activities!
Body systems work together like a team to help us move. This teamwork involves our muscles, joints, nerves, and heart. Let’s break it down:
Muscles: We have over 600 muscles in our body. These muscles help us move by getting shorter and tighter, which is called contracting. For example, when you lift your arm, your biceps and triceps pull against each other. One helps bend your elbow, and the other helps straighten it.
Joints: Adults have about 360 joints. Joints are where two bones meet, and they help our body move in different ways. Some joints, like the knee, only allow movement in one direction. These are called hinge joints. Others, like the shoulder, let us move in many directions. These are called ball-and-socket joints.
Nervous System: Our brain sends signals to our muscles super fast—up to 120 meters per second! This quick messaging helps us move smoothly and stay coordinated.
Cardiovascular System: When we exercise, our heart beats faster—sometimes by more than 100 beats per minute. This helps deliver oxygen to our muscles so they can keep working.
All these systems work together so we can do things like run, jump, and throw. This teamwork is important for both sports and everyday activities!