1. What is this?

2. How is a hurricane like a living thing?

3. How is a hurricane like a living thing?
organized
uses energy
circulation
grows
limited existence

4. Inside the eye of hurricane George

5. Concept of Life

6. How do we know when something is alive?
How do we know when it’s dead?
Think of instances where it is hard to tell if something is living or non-living.

8. Functional MRI

9. Terry Schiavo

10. Viruses

11. Water Bears

13.
Water bears most extreme 4:39

14. A. Definition of Life
Scientists have not been able to agree upon a single, simple definition of life.
Living organisms perform certain functions that are taken to be the characteristics of life.

15. Herpes Virus

16. Living things are called organisms.
All organisms share certain characteristics.

17. Characteristics of Organisms
Highly organized
contain many complex chemical substances.
Made up of one or more cells.

18. Use energy.
Have a definite form & a limited size.
Have a limited life span.
Grow.

19. Respond to changes in the environment.
Able to reproduce.
Groups of living things evolve, or change over time.

20. HOMEOSTASIS! The condition of a constant internal environment.
Occurs when all life processes are in balance.

21. Living Things Carry Out Many Processes
What are some things organisms do?

23. Nutrition
Process of taking in materials (nutrients) from the external environment and changing them into usable forms.

24. 2 Types of Nutrition
Autotrophs – make their own nutrients (plants & some bacteria)
Heterotrophs – must get nutrients from the environment (humans)

27. What life process is depicted below?

28. What life process is depicted below?
Pooping is NOT excretion!
What kind of waste is being removed during pooping?
Pooping (Egestion) is the removal of undigested waste

29. Egestion is the removal of undigested waste
Excretion is the removal of metabolic waste

30. So…. what life process is pooping
part of?

31. Nutrition includes: Ingestion – taking in food.
Digestion – break down of food
into smaller, usable pieces.
Egestion – (defication) removal
of undigested waste

32. Which life process is related to a plant that has shriveled because of a lack of water?
nutrition
Why isn’t the answer “regulation”?

33. Why isn’t the answer “regulation”?
The plant didn’t “do anything” that resulted in the shriveling.
Regulation involves mechanisms that do opposing actions to maintain dynamic equilibrium

34. Growth, Synthesis, Regulation
A cut heals when skin cells multiply.
Which life process is involved?
Growth, Synthesis, Regulation
Why isn’t this example considered reproduction?
It does not produce a new individual organism

35. Which life process is involved when a plant such as poison ivy makes a toxin?
synthesis

36. Dinosaurs became extinct millions of years ago
Dinosaurs became extinct millions of years ago. Which life process was there a lack of?
reproduction

38. Transport
The process by which substances enter and leave cells and become distributed within cells (circulatory system).

40. Respiration Process of releasing chemical energy stored in nutrients.
Not breathing! Can occur in presence or absence of oxygen.

41. What life process is illustrated here?

43. Synthesis
Making more complex substances from simpler ones

46. Growth
Process by which living things increase in size as a result of growth in individual cells or in the number of cells.

48. Excretion Process of ridding the body of wastes.
Sweating, urinating, exhaling.
NOT pooping!

50. Regulation All activities that help to maintain homeostasis.
Involves the nervous and endocrine systems (brain, spinal cord, nerves, hormones).

52. Reproduction
Process by which living things produce new organisms of their own kind.
Not necessary for the survival of an individual, but is necessary for survival of a species.

53. Special Case - Metabolism
All chemical reactions occurring within the cells of an organism.

54. Metabolism includes processes that breakdown substances as well as those that build substances.
The single most important characteristic of life!