BIO 253 - Exam 1 Answers Rated A+

BIO 253 - Exam 1 Answers Rated A+ Anatomy Structure Physiology Function Best NFL Rookie WRs in the 2021 Season! Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:45 Full screen Level of organization in the body - Atom - Molecule - Macromolecule - Cell - Tissue - Organ - Organ system - Organism Homeostasis Maintenance of a stable internal environment Negative feedback - Most common in body - Effectors return conditions to normal - Shuts off when normal state is reached, counters/corrects something - Long-lived - Think furnace thermostat - BP, glucose, temp, hormones Positive feedback - Change is intensified, keeps stimulating until homeostasis is reached - Can produce unstable conditions in the beginning - Short-lived - Labor, blood clotting, sneezing Axial skeleton - Head, neck, trunk - Down the middle Appendicular skeleton - Limbs, girdles - Peripherals Diaphragm - Separates thoracic & abdominopelvic cavities - Smooth muscle - Breathing Mediastinum - Space between lungs - Houses heart Serous membranes - Line closed cavities - Visceral - Parietal Visceral membranes Cover organs Parietal membranes Line the cavities Serous fluids Separates membranes Pleura Lungs Pericardium Heart Peritoneum GI tract Integumentary system - Skin, hair, nails, glands - Produces Vitamin D - Sensory, protection, temp regulation Skeletal system - Bones - Support Muscular system - Muscles - Movement, posture, heat Nervous system - Neurotransmitters - Nerve impulses - Yellow - Fast transmission of messages - Short-lived Endocrine system - Chemical messengers called hormones - Slow transmission of messages - Long-lived Cardiovascular system - Heart, blood vessels - Transport Lymph system - Lymph, lymph nodes, spleen - Green - Defensive Digestive system - Break down food - Excrete wastes Respiratory system - Lungs - Gas exchange of O2 & CO2 Urinary system - Kidneys, ureters, bladder, urethra - Removal of blood wastes - Regulates H2O, electrolytes, BP Reproductive system - Offspring - Transport of sex cells - Production of hormones Anatomical position To stand erect facing forward with arms at the sides and palms of the hands turned forward with