NUSC 1165 Exam 1 Questions With Complete Solutions.

Organization of life order - -atoms -molecules -cells -tissues -organ -organ system -organism Atoms - cannot be broken down (carbon, hydrogen, oxygen, nitrogen) Molecules - formed by atoms held together by chemical bonds cells - formed by molecules tissues - groups of similar cells organ - perform specialized functions organ system - group of organs that work together organism - functioning of organ systems Organ systems involved with obtaining and using nutrients for food - -digestive system -nervous system -endocrine systemOrgan Systems responsible of eliminating waste - -urinary system -respiratory system -integumentary system Digestive system - -ingestion and digestion of food -facilitates the movement of nutrients in the body -responsible for eliminating unabsorbed waste Nervous system - sends nerve signals to help control the passage of food throughout the digestive tract endocrine system - produces hormones to regulate food intake and the function of digestive organs Urinary system - -elimination of fluids (water, electrolytes, sodium) Respiratory system - -removes carbon dioxide from the body