BIO 235 Assignment 1 Exam Questions and Answers 100% Pass

BIO 235 Assignment 1 Exam Questions and Answers 100% Pass Discuss the importance of homeostasis within the body's fluids. Which fluid makes up the body's internal environment? Describe this fluid and explain why it is important. - a. Homeostasis is the maintenance of stability of internal environment by body fluid as osmolarity of body and blood volume. Blood volume and extracellular fluid in the body maintains osmolarity of body or internal environment of the body. Blood volume maintains circulation in the body as functions of cardiovascular system and circulatory pathway within the body. It also maintains body temperature and helps circulation of nutrients in the body. Body osmolarity normally maintains ionic or solute balance and water balance within the body. All cellular reactions and metabolism occurs in the water as solvent. 2 100% Pass Guarantee Katelyn Whitman, All Rights Name the cavities of the trunk and the serous membranes that line them. - a. Thoracic and abdominopelvic cavities are the two cavities of the trunk. Thoracic cavity can be divided into three smaller cavities called the pericardial cavity, and two fluid filled spaces called pleural cavities. The pleura cavity is lined by the pericardium, the pleural cavity is lined by the pleura b. Serous membrane cavities are normally empty and consist of a single layer of flattened mesothelial cells. Serous Membranes that covering serous cavity are called parietal and that covering viscera are called visceral Describe the functions of water in the body. Explain why water molecules have positive and negative "poles." - a. Water comprises 65-70% of the human body. The chemical properties of water make it the primary source of energy for all functions in the body. Water transfers its hydrolytic energy to the elements as it breaks down in the body and thus plays an overarching role in energy metabolism and body physiology. b. Water aids in digestion, prevents constipation, it helps with the removal in toxins via urine, sweat and breathing. 3 100% Pass Guarantee Katelyn Whitman, All Rights Define mixture and then distinguish between the three types of mixtures called solutions, colloids, and suspensions. - a. A mixture is defined as a combination of different substances formed when two or more individual substances are mixed together. b. A solution- can be defined as a complete mixture of two or more substances where the individual compounds are completely mixed and do not separate upon filtration or upon standing. Light does not scatter when passing through solutions. c. Suspension- is a heterogeneous mixture of two or more compounds where the size of solutes is very different. Particles in a suspension separate when standing and they can also be separated through filtration/ They may scatter in light depending upon the property of the individual solutes. d. Colloids- are also heterogenous mixtures that contain particles of various sizes dispersed throughout the mixture. Colloids have a particle size of between 1-1000 nanometers and like solutions, they cannot be separated through filtration and do not separate when standing. Due to the presence of particles in the mixture the light is 4 100% Pass Guarantee Katelyn Whitman, All Rights Briefly describe the fluid mosaic model and the five different functions of integral membrane proteins. - a. The fluid mosaic model describes the cell membrane as a tapestry of several types of molecules (phospholipids, cholesterols, and proteins) that are constantly moving. This movement helps the cell membrane maintain its role as a barrier between the inside and outside of the cell environments. b. fluid mosaic model was proposed by S.J. Singer and Garth L. Nicolson. This model explains the structure of the plasma membr