SCIENCE 2ND QT TEST - MUSCULAR SYSTEM

• The muscular system moves the body, gives it posture, and circulates the blood.
• Some muscles are controlled by thoughts and allow you to do various things.
• The heart beats automatically, indicating that some muscles work without thinking like the heart beating.
• All of the muscles in the body's muscular system make up the body's muscular system.
• There are over 650 muscles in the human body.
• The muscular system is built up of three types of muscles: skeletal, smooth, and cardiac.
• Skeletal muscles lie under the skin, are made up of long threads or fibers, and control the movement, posture, and balance of the body.
• Tendons are cord-like tough connective tissues that connect skeletal muscle to the skeleton.
• Skeletal muscles are voluntary which means they can be controlled directly with signals from the brain.
• Smooth muscles, also known as special muscles, control organs within the body.
• Smooth muscles help to move food through the digestive system, line up the intestine and the stomach, and move the diaphragm which aids in breathing.
• Smooth muscles also make blood vessels relax and tighten.
• Cardiac muscle is located in the heart, the fibers of which form a net-like structure and build up the chambers of the heart.
• Cardiac muscle contracts and relaxes, causing blood to move in and out of the heart chambers.
• Cardiac muscle is involuntary muscle, meaning it moves automatically.
• Exercising, getting enough rest, and eating a balanced diet can help to keep the muscular system healthy.
• The muscular system consists of 43 muscles for smiling and 17 muscles for frowning.
• The strongest muscle in the body is the masseter, located in the jaw and used for chewing.
• The smallest muscle in the body is the stapedius, located in the middle ear.
• The largest muscle in the body is the gluteus maximus, which moves the thigh bone away from the body and strengthens the hip joint.