1 / 34

Life Functions

Life Functions. Life functions are processes that are needed to maintain a stable or constant environment within, even though the external and internal environment may be constantly changing. Nutrition.

macgregor
Download Presentation

Life Functions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Life Functions Life functions are processes that are needed to maintain a stable or constant environment within, even though the external and internal environment may be constantly changing.

  2. Nutrition • 1) Nutrition: Activities by which an organism obtains materials from its environment and prepares them for use.

  3. NUTRITION Nutrients are substances needed for energy growth, repair and maintenance The 6 nutrients are: vitaminsproteins mineralscarbohydrates waterlipids (fats)

  4. NUTRITION • 2 types • 1) Autotrophic: Complex nutrients are produced (synthesized) from simple substances in the environment. (plants and some bacteria). 2) Heterotrophic: Other organisms obtain nutrients from the environment (they do not synthesize their own food)

  5. Heterotroph or Autotroph?

  6. Heterotroph or Autotroph?

  7. Heterotroph or Autotroph?

  8. Heterotroph or Autotroph?

  9. Heterotroph or Autotroph?

  10. Nutrition Ingestion: taking food in from the environment. Digestion: breakdown of complex foods into simpler forms that can be used by an organism. Egestion: to discharge undigested waste products from the body

  11. TRANSPORT 2) Transport: process by which substances enter and leave cells and the distribution of materials within an organism. • Simple organisms: direct exchange with environment

  12. Complex organisms: all cells are not in contact with the environment. The circulatory system allows blood to carry nutrients , oxygen and wastes.

  13. TRANSPORT Plants: have specialized structures called xylem and phloem to transport substances from the roots to the stems and leaves.

  14. RESPIRATION 3) Respiration: all life processes require a supply of energy. Energy comes from the chemical energy stored in nutrients. The process of releasing chemical energy is called respiration.

  15. Oxygen Respiration Turning food into energy 2 types: Aerobic: glucose + oxygen = water + carbon dioxide + energy Anaerobic: respiration without the use of oxygen. Carbon dioxide

  16. EXCRETION • 4) Excretion: is the removal of cellular waste products produced as a result of metabolic activities. (chemical reactions) CO2,urine,sweat • .

  17. Simple organisms release their wastes directly into the environment. Complex organisms use a system that is responsible for waste removal.

  18. SYNTHESIS • 5) Synthesis: simple substances are combined to form complex substances • These substances that are combined are usually the products of digestion.

  19. Assimilation: the incorporation of materials into an organism. Materials that are produced by synthesis can become part of the structure of the organism or used to repair or replace worn out parts and allow for growth

  20. REGULATION 6. Regulation: the control and coordination of the various activities of an organism, including responses to stimuli. These activities help maintain an organisms homeostasis The nervous and endocrine system regulates the other systems

  21. Danger Zone Homeostasis TEMPERATURE Danger Zone Time

  22. 9. Regulation • Staying out of danger (reflexes) • Constant body temperature (Nervous system) • Constant water level (Excretory system) • Constant blood sugar level (Endocrine System) • Constant blood pressure (Nervous System) Homeostasis Blood Sugar Time

  23. GROWTH 7.Growth: the result of the assimilation of nutrients. This results in the increase in the # and size of cells.

  24. REPRODUCTION 8.Reproduction: involves the production of a new individual. This can sexual or asexual. Sexual requires 2 parent cells and the offspring will show variation.

  25. Asexual reproduction requires one parent cell and offspring are identical to the original.

  26. METABOLISM *Metabolism:all the chemical reactions occurring within the cells of an organism. (this involves all life processes)

  27. HOMEOSTASIS *Homeostasis: the condition of a stable internal environment. (internal balance) (involves all processes)

  28. MR STRANGER rowth ransport ynthesis xcretion utrition etabolism egulation ssimilation eproduction espiration

  29. Which Life Function Is It? Excretion Nutrition Transport Regulation Excretion Reproduction Nutrition Synthesis Assimilation

  30. The body temperature of a runner increases. The runner responds by perspiring, which lowers body temperature. This process is an example of…. • maintenance of homeostasis • transport • locomotion • reproduction

  31. If a human system fails to function properly, what is the most likely result? • a stable rate of metabolism • a disturbance in homeostasis • a change in the method of respiration • a change in the DNA

  32. Which life process is classified as autotrophic in some organisms and heterotrophic in other organisms? • hormonal regulation • nutrition • anaerobic respiration • transport

  33. When an individual goes without eating for a day, his or her blood sugar level remains about the same throughout the day. This relatively constant condition is maintained by…… • regulation • egestion • reproduction • growth of cells

  34. Why is this organism considered a heterotroph rather than an autotroph? • It manufactures its own food. • It does asexual reproduction. • It performs photosynthesis. • It absorbs nutrients.

More Related