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The Body Growth and Development By: Elizabeth Budd The Nervous System Carries messages to and from the brain and all other parts of the body and helps cause our reflexes Brain: control center of the body Spinal Cord: carries messages between the brain and the body Nerve Cells: a small unit of the nervous system The Cardiovascular System Moves nutrients, hormones, and gases throughout the body Blood: carries nutrients, oxygen and other things to cells Blood Vessels: tubes that carry blood throughout the body Heart: muscle that pumps blood throughout the body The Immune System Removes bad organisms from the blood and fights sickness Lymph Node: structure that kills sickness Spleen: filters bad things from the blood Thymus Gland: causes white blood cells to become T-cells that kill off sickness The Respiratory System Provides body cells with oxygen and removes carbon dioxide Trachea: tube where air moves to the lungs Bronchi: two tubes that air goes through after the trachea to the lungs Lungs: main organs Cilia: smalls hairs that remove dust from the air we breath The Muscular System Consists of muscles that provide motion and maintain posture Voluntary Muscles: muscles you can control Arms, legs Involuntary Muscles: muscles you cant control stomach, lungs The Skeletal System Serves as the frame of your body, protects your organs, and works with muscles so you can move! Bones: hard material of the skeletal system Bone Marrow: the tissue inside of your bones Cartilage: tissue at the end of your bones that helps connect some bones Ligaments: tough fiber that connects some bones Joints: where two bones meet