The document summarizes key body systems including the skeletal, muscular, endocrine, reproductive, and nervous systems. The skeletal system functions to support and protect internal organs. It is made up of 206 bones including long, short, flat, and irregular bones. The skeletal system works with the muscular system. The muscular system produces movement in the body and consists of skeletal muscles that are voluntary and involuntary muscles like the heart. The endocrine system creates hormones that control functions like growth and digestion. Glands secrete hormones that travel through the bloodstream to control organs. The reproductive system functions to produce new living organisms. Its main organs are ovaries and testes that produce eggs and sperm, respectively.

1. 7 th Grade Chapter 3 Lesson 4 Pgs. 94-99 For Student Use Only

2. Systems Skeletal System: Function of SS: support and protect internal organs Made of 206 bones Parts of SS: Ligaments- join bone to bone Long Bones Short Bones Flat Bones Irregular Bones

3. Systems Bones of the SS: Long Bones- humerus (upper arm) and femur (thigh bone)- support weight of body and movement Short Bones- phalanges (fingers)- same as long bones but smaller Flat Bones- ribs and cranium- protect vital organs Irregular Bone- vertabrae (backbone)- bones that do not fit in other categories.

4. Systems Functions of SS: 1. Give support and shape to body 3. Protects vital organs 2. Provides attachments for muscle Works with the muscular system Houses bone marrow which makes the red blood cells. Marrow- soft, fatty system of vessels found in the porous center of a long bone

5. Systems Muscular System: Function of MS: produce movement for your body ½ bodies weight is muscle 650 muscles in the body Parts of the Muscular System Skeletal Muscles- (voluntary) you control Tendons: connect bone to muscle Involuntary Muscles- heart, digestive system, respiratory system

6. Systems Endocrine System: Function of ES- to create chemicals called hormones Hormones- chemical substances which control growth, digestion, etc. Parts of ES: Gland- a structure that secretes some substance (use ductless glands or endocrine glands) All substances have to travel through the blood stream

7. Systems Endocrine System: Exerts control on organs Causes organs to speed up or slow down Certain hormones only control certain organs Hormones help nervous system control body

8. Systems Reproductive System: Function of RS: to produce new living organisms Main Organs: Ovaries- FEMALE- produce egg Egg- female reproductive cell Testes- MALE- produce sperm Sperm- male reproductive cell Endocrine system (hormones) create differences in men and woman

9. Systems Nervous System: Function of NS: coordinate the activities of your body- control body functions Central Nervous System- consists of brain and spinal cord Peripheral Nervous System- composed of nerves and nerve tissue called ganglia Impulses- electrochemical messages Impulses travel from brain throughout the body