SFSU BIO 230 FINAL EXAM QUESTIONS WITH CORRECT ANSWERS

Why is homeostasis important? CORRECT ANSWER to maintain a relatively stable environment, within limits. How does the body maintain homeostasis? CORRECT ANSWER through cooperation of multiple organ systems, including the endocrine and nervous system What is a homeostatic set point? CORRECT ANSWER The level in where the temperature of the body is maintained. Which organs are involved in water, and glucose balance? CORRECT ANSWER The small intestine is involved with balancing water. The pancreas is involved in balancing glucose. Where do different molecules enter your body? CORRECT ANSWER The Blood Stream. How are they absorbed? CORRECT ANSWER osmosis How do they get to other regions of the body? CORRECT ANSWER Through the blood stream What are capillaries? CORRECT ANSWER any of the fine branching blood vessels that form a network between the arterioles and venules. What is interstitial space? CORRECT ANSWER space/fluid in BETWEEN cells How do different types of molecules (water, glucose, oxygen, sodium, chloride) cross cell membranes and travel between different organs? CORRECT ANSWER Cell membrane is semipermeable to water. Oxygen move across cell membranes simple diffusion, a process that requires no energy input and is driven by differences in concentration on either side of the cell membrane. Food is broken up through digestion and diffuse into the blood through microvilli in the intestinal wall. How is water regulated in your body? CORRECT ANSWER Homeostasis What is osmosis and what does it have to do with water balance? CORRECT ANSWER The diffusion of water to create an equilibrium with salt. Where does the water in your body come from? CORRECT ANSWER Liquids, foods and cellular respiration.