- The Skeletal System provides structural support, protects vital organs, facilitates movement by serving as attachment points for muscles, stores minerals and fat, and is the site of blood cell production in bone marrow.
- The Digestive System processes food through ingestion, digestion (mechanical and chemical), absorption of nutrients, and elimination of waste. It includes the gastrointestinal tract (mouth, esophagus, stomach, intestines) and accessory organs (liver, pancreas, gallbladder, salivary glands).
- The Respiratory System enables gas exchange: oxygen is taken in and carbon dioxide is expelled. It consists of conducting zones (nose, pharynx, larynx, trachea, bronchi) that move air, and respiratory zones (alveoli, bronchioles) where gas exchange occurs in the lungs.
- The Circulatory System transports oxygenated blood from the heart to tissues via arteries and returns deoxygenated blood to the heart via veins. The heart pumps blood, and red blood cells carry oxygen; white blood cells provide immunity, and platelets aid clotting.
- The Nervous System receives sensory input, integrates information, and produces motor output. It is divided into the Central Nervous System (brain and spinal cord) and Peripheral Nervous System (nerves). The voluntary system controls conscious actions; the involuntary system (sympathetic and parasympathetic) regulates automatic functions like heartbeat and digestion.
- The Special Senses include vision (eye structures: cornea, lens, retina, optic nerve), hearing and balance (ear structures: cochlea, semicircular canals, vestibule), taste (tongue papillae and cranial nerves VII and IX), and smell (olfactory epithelium and nerve CN I). Each sense converts stimuli into neural signals sent to the brain.
Parent Tip: Review the logic above to help your child master the concept of body systems worksheet.
