Fundamentals of Organismal Biology

From the study guide

Course Outline

  1. Characteristics of Living Organisms
  2. Homeostasis and Feedback
  3. Anatomy vs Physiology
  4. Countercurrent Exchange System
  5. Endothermy vs Ectothermy
  6. Homeothermy vs Poikilothermy
  7. Osmoconformers vs Osmoregulators
  8. Hormones and Glands
  9. Reproductive Processes

1. Characteristics of Living Organisms

Key Concepts & Definitions

  • Characteristics of Living Organisms: Traits that distinguish living entities from non-living matter, including growth, reproduction, metabolism, response to stimuli, and homeostasis (see section 2).
  • Physiological Responses: Immediate, functional reactions of organisms to environmental stimuli, such as sweating to cool down or shivering to generate heat (examples of responses to heat and cold).
  • Behavioral Responses: Actions taken by organisms to adapt or respond to environmental changes, like seeking shade or burrowing to escape extreme temperatures (examples of responses to heat and cold).
  • Long-term Adaptation: Genetic or phenotypic changes that enhance survival in specific environments over generations, such as thick fur in cold climates or increased sweat gland efficiency in heat (examples of long-term adaptation to heat and cold).
  • Homeostasis: The maintenance of a stable internal environment despite external fluctuations, fundamental to living organisms’ survival (see section 2).
  • Evolutionary Adaptation: The process by which populations develop traits that…
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Practice quiz preview

1. What is a fundamental characteristic that distinguishes living organisms from non-living matter?

2. Who is the author that defined homeostasis in 1932?

3. What is the primary role or purpose of physiology in biological sciences?

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Flashcard preview

Characteristics of Living Organisms

Traits that distinguish living entities from non-living matter.

Physiological Responses — example?

Rapid functional reactions like sweating or shivering.

Behavioral Responses — example?

Actions like seeking shade or burrowing.

Long-term Adaptation — example?

Thick fur in cold climates or increased pigmentation in deserts.

Homeostasis — definition?

Maintaining a stable internal environment.

Evolutionary Adaptation — process?

Genetic or phenotypic changes over generations for survival.

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