As Rebecca walks back home, a car comes out of nowhere and almost runs her over. Her nervous system, specifically the voluntary nervous system, jolts her body away from the car. This was a somatic reflex. The reflex arc started with her eyes, the sensory receptor, and then the sensory neuron went through the integration center in the spinal chord and exited as a motor neuron which went to the effector, her skeletal muscles. This entire process happened within seconds.
Rebecca jolted back so far that she fell. She uses her skeletal system to get back up. The skeletal muscles, attached to bones by tendons, use the bones as levers to move the body. The long bones in her legs, femur, tibia, and fibula, are support beams for the muscles as she rises from the ground.
Rebecca soon realizes that she scraped her hip on the pavement. The integumentary system has been affected and damaged. The top layer of skin, the epidermis, has been scraped away and top of the dermis is exposed. Blood vessels in the dermis are broken and blood is released. In the deepest layer of the skin, stratum basale, the epidermal cells are dividing and the daughter celss are being pushed up to become part of the higher epidermal layers.
After a long tiring day, Rebecca comes home and uses the restroom. Her urinary system is expelling wastes in the liquid state. At this point, her fluids have filtered through her kidneys and the ureters have transferred the urine to the bladder. Here, urine is held temporarily until Rebecca expels it through the opening of her urethra.
BIbliography “What Is Menstruation? Cycle, Irregular, Symptoms, Painful & Absence.” MedicineNet, www.medicinenet.com/menstruation/article.htm. Zimmermann, Kim Ann. “Endocrine System: Facts, Functions and Diseases.” Live Science, 15 Feb. 2018, www.livescience.com/26496-endocrine-system.html. “Your Digestive System & How It Works.” National Institute of Diabetes and Digestive and Kidney Diseases, U.S. Department of Health and Human Services, 1 Dec. 2017, www.niddk.nih.gov/health-information/digestive-diseases/digestive- system-how-it-works. “How Your Immune System Fights Infection.” WebMD, WebMD, www.webmd.com/cold-and-flu/immune-system-fight-infection#1. “Fight Cold Season By Draining Lymph Nodes - Blue Creek.” Blue Creek Therapeutic Health Spa Denver, 3 Oct. 2017, www.bluecreekhealth.com/posts/draining-lymph-nodes/. “Cuts, Scratches, and Abrasions.” Edited by Yamini Durani, KidsHealth, The Nemours Foundation, Jan. 2015, kidshealth.org/en/kids/cuts.html. Marieb, Elaine Nicpon. Essentials of Human Anatomy & Physiology. Pearson/Benjamin Cummings, 2006.