ASU BIO 100 EXAM 3 Questions and Answers

Explain the functions of each system of the body: Digestive Ans: Mechanical and chemical breakdown/digestion of food. Absorption of nutrients. Undigested waste product that is eliminated. Explain the functions of each system of the body: Cardiovascular (respiratory and circulatory) Ans: Transportation (blood delivers oxygen and nutrients), regulation of body temperature, and immunity Explain the functions of each system of the body: Immune Ans: Battle infection, maintain homeostasis by eliminating damaged cells, protects the body against foreign organisms. Explain the functions of each system of the body: Skeletal Ans: support, movement, storage of minerals (bone marrow) blood cell formation Explain the functions of each system of the body: muscular Ans: movement, maintenance of body posture, production of heat, contraction of the heart, blood pressure maintenance, intestinal movement (elimination of feces) Explain the functions of each system of the body: Endocrine Ans: Communication, integration, and control (hormonally) Explain the functions of each system of the body: Reproductive Ans: ensures survival of the human race Explain the functions of each system of the body: Nervous Ans: Communication, integration, control, recognition of sensory stimuli (CNS & PNS) Compare and contrast how positive and negative feedback mechanisms are used to maintain homeostasis. Use these concepts to describe: The maintenance of blood glucose levels: Ans: The control of blood sugar (glucose) by insulin is another good example of a negative feedback mechanism. When blood sugar rises, receptors in the body sense a change. In turn, the control center (pancreas) secretes insulin into the blood effectively lowering blood sugar levels. Once blood sugar levels reach homeostasis, the pancreas stops releasing insulin. Compare and contrast how positive and negative feedback mechanisms are used to maintain homeostasis. Use these concepts to describe: The release of platelets to form blood clots: Ans: once a vessel is damaged, platelets start to cling to the injured site and release chemicals that attract more platelets. The platelets continue to pile up and release chemicals until a clot is