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Interpret the graphs, variables, and terms in the linear, exponential, and logistic population growth models to describe and predict how population size and growth rate will change over time. Population ecologists make use of a variety of methods to model population dynamics mathematically.
The two simplest models of population growth use deterministic equations (equations that do not account for random events) to describe the rate of change in the size of a population over time. The first of these models, exponential growth, describes theoretical populations that increase in numbers without any limits to their growth.
- Homeostasis Definition
- Homeostatic Processes
- Homeostasis in The Human Body
- Components of Homeostasis
- Homeostatic Mechanisms
- Biological Importance of Homeostasis
- References
- Further Reading
Homeostasis definition in biology is the ability or tendency of the body or a cell to seek and maintain a condition of equilibrium – a stable internal environment — as it deals with external changes. It makes use of feedback controls and other regulatory mechanisms or dynamic processes in order to maintain a constant internal environment. It can be...
An organism needs a system that effectively interconnects various biological processes and functions. The human body, for instance, has bodily organs made up of cells functioning in unison. These organs, although distinct from one another, have to work alongside each other in order to sustain a set of internal conditions within the ideal range. The...
The human body would not be able to function efficiently if there is a prolonged imbalance in the internal physical conditions and chemical composition. Just like any other living thing, the human body employs various homeostatic mechanisms to sustain its optimal functioning. Variables such as body temperature, pH, sodium level, potassium level, ca...
The components of homeostasis are: (1) a receptor, (2) a control center, and (3) an effector. The receptor, as the name implies, is that part of a homeostatic system that receivesinformation regarding the status of the body. It monitors and perceives the changes in its environment, both internal and external. It is in the form of a sensory nerve te...
Homeostatic mechanisms that respond to a perturbation may be in the form of a looping mechanism (called feedback mechanism) that may be positive or negative. Positive feedback maintainsthe direction of the stimulus. It tends to accelerate or promote the effect of the stimulus. Examples are labor contractions, blood clotting, and action potential ge...
Homeostasis is important to maintain internal stability and sustain life. Without these homeostatic mechanisms to ensure that the innate variables are kept within the optimal or suitable values, there would be instability in the body. The system would not be able to function properly and efficiently. In the long run, the individual would get ill, o...
Tansey, Etain A.; Johnson, Christopher D (2015). “Recent advances in thermoregulation”. Advances in Physiology Education. 39 (3): 139–148.Campbell, Neil A. (1990). Biology (Second ed.). Redwood City, California: The Benjamin/Cummings Publishing Company.Control of Blood Pressure. (2015). Retrieved from Cliffsnotes.com website: https://www.cliffsnotes.com/study-guides/anatomy-and-physiology/the-cardiovascular-system/control-of-blood-pressureBrini, M., Ottolini, D., Calì, T., & Carafoli, E. (2013). “Chapter 4. Calcium in Health and Disease”. In Sigel A, Helmut RK (eds.). Interrelations between Essential Metal Ions and Human Diseases. M...Radiant Heating Factsheet: Comfortable, Efficient & Healthy. Building Biology Institute. https://buildingbiologyinstitute.org/free-fact-sheets/radiant-heating/
In Equations 2 and 5, we showed how to calculate the size of the population one time unit into the future. What if you wanted to know how big the population will be at some distant future time? You could carry out the one-time-step calculations many times, until you arrived at the desired answer.
Apr 28, 2017 · Population biology is the study of population characteristics and the factors that affect their size and distribution. The characteristics which are studied include the migratory patterns , the population density, the demographics (the birth and death rates, sex ratio and age distribution), the population genetics , the life history traits and ...
May 26, 2022 · Biology is the branch of science that primarily deals with structure, function, growth, evolution, and distribution of organisms. Find out more about biology definition, principles, branches, and importance.
An example of density-dependent regulation is shown in figure \(\PageIndex{f}\) with results from a study focusing on the giant intestinal roundworm (Ascaris lumbricoides), a parasite of humans and other mammals. Denser populations of the parasite exhibited lower fecundity: they contained fewer eggs.
