Explain How Does The Body Maintain Homeostasis
1. Briefly explain how does the body maintain homeostasis?
Homeostasis is a existence and maintenance of a relatively constant internal environment. Homeostasis is maintain by negative and positive feedback mechanism. Most homeostatic control mechanisms are negative feedback mechanisms. In these system, the output shut off the original stimulus or reduce its intensity. These mechanisms cause the variable to change in a direction opposite to that of the initial change, returning it to its “ideal” value, thus the name “negative” feedback mechanism. In positive feedback mechanisms, the result or response enhances the original stimulus so that the response is accelerated. This feedback mechanisms is ”positive” because the change that results proceed in the same direction as the initial change, causing the variable to deviate further and further from its original value or range.
2. EXPLAIN the functions of plasma membrane components:
a) Phospholipids …show more content…
First, the structure of phospholipids is responsible for the basic function of membranes as barriers between two aqueous compartments. Because the interior of the phospholipid bilayer is occupied by hydrophobic fatty acid chains, the membrane is impermeable to water-soluble molecules, including ions and most biological molecules. Second, bilayers of the naturally occurring phospholipids are viscous fluids, not solids. The fatty acids of most natural phospholipids have one or more double bonds, which introduce kinks into the hydrocarbon chains and make them difficult to pack together. The long hydrocarbon chains of the fatty acids therefore move freely in the interior of the membrane, so the membrane itself is soft and flexible. In addition, both phospholipids and proteins are free to diffuse laterally within the membrane—a property that is critical for many membrane
Homeostasis is a existence and maintenance of a relatively constant internal environment. Homeostasis is maintain by negative and positive feedback mechanism. Most homeostatic control mechanisms are negative feedback mechanisms. In these system, the output shut off the original stimulus or reduce its intensity. These mechanisms cause the variable to change in a direction opposite to that of the initial change, returning it to its “ideal” value, thus the name “negative” feedback mechanism. In positive feedback mechanisms, the result or response enhances the original stimulus so that the response is accelerated. This feedback mechanisms is ”positive” because the change that results proceed in the same direction as the initial change, causing the variable to deviate further and further from its original value or range.
2. EXPLAIN the functions of plasma membrane components:
a) Phospholipids …show more content…
First, the structure of phospholipids is responsible for the basic function of membranes as barriers between two aqueous compartments. Because the interior of the phospholipid bilayer is occupied by hydrophobic fatty acid chains, the membrane is impermeable to water-soluble molecules, including ions and most biological molecules. Second, bilayers of the naturally occurring phospholipids are viscous fluids, not solids. The fatty acids of most natural phospholipids have one or more double bonds, which introduce kinks into the hydrocarbon chains and make them difficult to pack together. The long hydrocarbon chains of the fatty acids therefore move freely in the interior of the membrane, so the membrane itself is soft and flexible. In addition, both phospholipids and proteins are free to diffuse laterally within the membrane—a property that is critical for many membrane