Presentation on theme: "The Muscular System: Interesting Facts"— Presentation transcript:
1The Muscular System: Interesting Facts Human Bio 11
2Interesting Facts You have more than 650 muscles. Muscles make up 40% of your body mass.
3Interesting Facts Muscles contract (shorten). They pull on bones, producing movement.You are constantly moving.Even when you are sleeping.Muscle cells cannot partially contract.They either contract 100% or do not contract at all.
4Interesting Facts Shivering: Cramp: When you are cold, your muscles produce rapid contractions to generate body heat.Cramp:A painful muscle contraction.
5Interesting Facts Spasm: Tetanus: A rapid involuntary contraction of a muscle.Example: an eye twitchTetanus:A persistent, severe contraction that can be caused by a bacterial infection.A tetanus shot can help prevent this.Example: tetanus can cause lock jaw.