The intracellular fluid (ICF) compartment is the system that includes all fluid enclosed in cells by their plasma membranes. Extracellular fluid (ECF) surrounds all cells in the body. Fluid Compartmentsīody fluids can be discussed in terms of their specific fluid compartment, a location that is largely separate from another compartment by some form of a physical barrier. In contrast, teeth have the lowest proportion of water, at 8â∱0 percent.įigure 26.2 Water Content of the Bodyâs Organs and Tissues Water content varies in different body organs and tissues, from as little as 8 percent in the teeth to as much as 85 percent in the brain. Your brain and kidneys have the highest proportions of water, which composes 80â∸5 percent of their masses. The percent of body water changes with development, because the proportions of the body given over to each organ and to muscles, fat, bone, and other tissues change from infancy to adulthood ( Figure 26.2). Human beings are mostly water, ranging from about 75 percent of body mass in infants to about 50â∶0 percent in adult men and women, to as low as 45 percent in old age. An appropriate balance of solutes inside and outside of cells must be maintained to ensure normal function. As a result, water will move into and out of cells and tissues, depending on the relative concentrations of the water and solutes found there. Osmosis is basically the diffusion of water from regions of higher concentration to regions of lower concentration, along an osmotic gradient across a semi-permeable membrane. In the body, water moves through semi-permeable membranes of cells and from one compartment of the body to another by a process called osmosis. For instance, sodium ions (Na +) and chloride ions (Cl -) are often referred to as electrolytes. Often in medicine, a mineral dissociated from a salt that carries an electrical charge (an ion) is called and electrolyte. In the human body, solutes vary in different parts of the body, but may include proteinsâincluding those that transport lipids, carbohydrates, and, very importantly, electrolytes. The dissolved substances in a solution are called solutes. The chemical reactions of life take place in aqueous solutions. Identify the causes and symptoms of edema.Explain the importance of protein channels in the movement of solutes. ![]() Contrast the composition of the intracellular fluid with that of the extracellular fluid.Explain the importance of water in the body. ![]() Body Fluids and Fluid Compartmentsīy the end of this section, you will be able to: Understanding the ways in which the body maintains these critical balances is key to understanding good health. The interactions of various aqueous solutionsâsolutions in which water is the solventâare continuously monitored and adjusted by a large suite of interconnected feedback systems in your body. Water is the most ubiquitous substance in the chemical reactions of life. Because metabolism relies on reactions that are all interconnected, any disruption might affect multiple organs or even organ systems. Too much or too little of a single substance can disrupt your bodily functions. In the human body, the substances that participate in chemical reactions must remain within narrows ranges of concentration. Homeostasis, or the maintenance of constant conditions in the body, is a fundamental property of all living things.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |