Unit 4: Summary. Similarities and Differences Between Living Things

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1 Unit 4: Summary Similarities and Differences Between Living Things

2 Review cell theory All living things made of cells Cells perform life functions Cells come from pre existing cells

3 What are life functions?

4 Metabolism Chemical reactions needed to live

5 How does an amoeba perform life functions

6 How do multi-celled organisms perform life functions?

7 Work together to help organisms maintain homeostasis

8 Homeostasis = Dynamic Equilibrium Define and draw in your notes

9 Homeostasis in cells requires: Transport Communication Feedback mechanisms

10 Cell transport Passive transport = diffusion

11 Diffusion Movement from high to low until it is equal on both sides

12

13 What diffused through our fake cells in the diffusion through a membrane lab

14 Water Starch indicator (iodine) glucose How do we know?

15 What didn t diffuse through the dialysis bags and why?

16 What can diffuse through cell membranes Water O 2 CO 2 alcohol

17 Diffusion of water = osmosis What happens to a cell in pure water? Water moves in cell swells What happens to a cell in salt? Water moves out cell shrinks

18 So how do cells survive in freshwater ecosystems?

19

20 Active transport Moves molecules from low to high REQUIRES ENERGY

21 Cellular communication Chemical messengers and receptor molecules are very specific because of their shape

22 Hormones = chemical messengers of the endocrine system

23 Neurotransmitters = chemical messengers of nerve cells

24 Both bind very specifically to receptor proteins in cell membranes

25 Feedback mechanisms maintain homeostasis Stimulus = change in environment response

26 Example in plants Guard cells open and close stomates in leaves

27 Environment = Hot Dry Response = stomates close less transpriation

28 Environment = cool and moist Response = stomates open more transpiration

29 Body temp controlled by sweating and shivering

30 Ex: Glucose levels controlled by hormones Hi blood glucose pancreas insulin decreases blood glucose Low glucose pancreas another hormone (glucagon) release of sugar from liver

31 Feedback loops maintain blood glucose Practice Homeostasis Questions

32 Life Functions =

33 Movement helps us respond to the environment

34 Respiration Release energy from food

35 Synthesis Making cell parts

36 Circulation Transport food and wastes within organisms

37 Excretion Waste removal

38 Digestion lysis = breakdown

39 Immunity Protect against invaders

40 Coordination and regulation Communication and control

41 Reproduction DNA replicates new cells

42 Organelles life functions

43 Body systems life functions Multi-celled organisms only

44 Life function chart

45 Movement Purpose Helps living things respond to environment

46 Flagella = whiplike tail

47 Sperm use flagella

48 Cilia

49 Throat cells

50 Skeletal muscle system Bones connected by ligaments Muscles connected by tendons

51 Respiration Purpose: Release energy from food Types: Aerobic = with O 2 Anaerobic = absence of O 2

52 Mitochondria

53

54 Respiration requires gas exchange =Respiratory system

55 Synthesis Purpose Make things Examples: photosynthesis Protein synthesis

56 Chloroplasts absorb sunlight

57 Ribosomes protein synthesis

58 Circulation Purpose = Transport of materials within an organism

59 Organelles = Cytoplasm

60 2 types of transport tissues in plants Xylem = carries water and nutrients up to leaves Phloem = carries sugar down to roots

61

62 Circulation in plants

63 Human Circulatory System

64 Heart pumps blood through arteries, veins and capillaries

65 Lymphatic System

66 Lymph collects body fluids and checks for disease

67 Excretion Purpose: Removal of cellular wastes Wastes include: CO 2, H 2 O, heat, nitrogen wastes urine and sweat

68 Cell membrane Organelle Water

69 Kidneys filter blood urine Excretory system

70 Digestion Function Lysis = break down Complex sugars simple sugars Proteins amino acids Fats fatty acids Body system digestive system (lots of enzymes) Organs (mouth, stomach, intestines)

71 Lysosomes (lots of acids and enzymes)

72 Digestive system

73 Digestive system Chemical digestion (enzymes and acids) Mechanical Chewing and churning

74 Immunity Purpose Prevent disease and kill pathogens Pathogens = disease causing organisms

75 Organelle = Cell membrane

76 Body system = immune system White blood cells travel in blood and lymph

77

78 Coordination and regulation Purpose Control life functions communication

79 Organelle = Nucleus Nucleus DNA heredity DNA enzymes chemical reactions

80

81 Nervous system

82 Nervous system Organs = brain and spinal chord Cells = nerve cells

83 Endocrine system biology.clc.uc.edu

84 Endocrine system Organs = glands release chemical messengers Called hormones

85 Reproduction Purpose: Necessary for the continuation of life 2 types Asexual genetically identical offspring Sexual diversity

86 Organelle = nucleus DNA replicates and cells split

87 Reproductive system Organs Females = ovaries eggs Males = testes sperm

88 Advantage of Sexual reproduction increased diversity

89 MRS. CEDICR Movement Respiration Synthesis Circulation Excretion Digestion Immunity Coordination and regulation reproduction

90 Cells and Tissues pyzsc8mq Tissue rap types-of-tissues-rap

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