BIOA02H3 Chapter Notes -Homeostasis, Thermostat, Aorta

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30 Jan 2011

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All animals need nutrients and oxygen and must eliminate carbon dioxide and other waste products of metabolism. single-celled organisms meet all these needs by direct exchange with the external environment. An internal environment makes complex multi-cellular animals possible. Internal environment the physical and chemical characteristics of the extracellular fluids of the body. individual cells get their nutrients from this extracellular fluid and dump their waste into it. a stable internal environment makes it possible for an animal to occupy habitats that would kill its cells if they were exposed to it directly. As multi-cellular organisms evolved, cells became specialized for maintaining specific aspects of the internal environment. Homeostasis the maintenance of a steady state, such as a constant temperature or a stable social structure, by means of physiological or behavioral feedback responses. if a physiological system fails to function properly, homeostasis is compromised, and as a result cells are damaged and can die.

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Does the environment around us affect gas exchange, such as air quality or pollution? Is there more or an affect with internal environments indoors or external environments outdoors? What about other factors such as smoking elevation or location Explain of gas exchange and how environment influences th eprocess of gas exchange

erincattle713

The maintenance of homeostasis is of major importance to all organ systems in the body and the overall survival of the individual. Explain how homeostasis is the maintenance of a dynamic range of environmental qualities rather than holding the internal environment at a set point. What would be wrong with a set point (say for body temperature) rather than a working range of temperatures?

The endocrine system is closely tied to homeostasis functioning. Give two examples of hormones (including their glands of origin and action) that play major roles in homeostatic processes in the body. What happens if these hormones are disrupted in their actions?

Also, look at how we adapt to survival in the outside world. Discuss how maintaining homeostasis gives us greater freedom of activity from dependence upon changes in the external environment. What happens during extremes that force our bodies out of homeostatic bounds? Give specific examples.

Why is the maintenance of homeostasis especially important during development of new humans within the bodies of their mothers? What can go wrong if specific homeostatic functions are disrupted?

goldcattle889

part 1

Homeostasis: Response to Stimuli

From the examples below, select the examples of cells or organisms responding to stimuli in order to maintain homeostasis.

1.)A plant bending toward a light source

2.)A cell bursting because it takes up too much water

3.)A person shivering when their body temperature is low

4.)A unicellular organism beating microscopic hairs to escape a chemical pollutant in its environment

5.)A cell dying due to a chemical poison

6.)An animal growing larger

7.)Ants moving within their mounds depending upon the time of day

8.)Iguanas laying in the sunlight if their body temperature is low

9.)Birds migrating when seasons change

10.)A person or animal getting sick because of infectious bacteria

part2 fill in the blank

A state of biological balance, or ____________ , is important for the survival of individual cells and ____________ alike.

Physiological factors such as ____________ , water levels, and pH must remain within a certain ____________ for cells and organisms to remain healthy and functional.

Regulation of the ____________ environment of cells and organisms is carried out through ____________ and other control ____________ .

choice of words:

location

external

hormones

mechanism

homeostasis

internal

groups

feedback

oganisms

temperature

range

BIOA02H3 Chapter Notes -Homeostasis, Thermostat, Aorta

BIOA02H3 Full Course Notes

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