DO NOW!!! http://study.com/academy/lesson/what-is-homeostasis-definition-examples-quiz.html#lesson = (stops at 2:42) Homeostasis

+ Cell Processes Unit 1 Lesson 5

Homeostasis Everything in body - has a set point Blood glucose level – fluctuates (changes) So your body is maintaining internal conditions.

What is homeostasis? The maintenance of a constant internal state in a changing environment. The environment within the cell is stable. Ensures cells can perform life processes. obtain and use energy, make new cells, exchange materials, and eliminate wastes in a changing environment. 4

Body Temp Example Human internal body temp – 98.60 Fahrenheit (37 degrees Celsius). The body can control temperature by making or releasing heat.

Transport Systems Unicellular organisms - exchange materials directly with the environment. 9

Transport Systems Multicellular organisms - cells work together to maintain homeostasis Transport systems to exchange materials from one place to another Animals - cardio vascular system. Plants – xylem (water) & phloem (nutrients)

Homeostasis in organisms Cold blooded animals adapt behavior to control body temp Trees - Dropping leaves during colder months.

Activity: Balancing Homeostasis Cut out 2 pictures show plants, animals, & humans maintaining homeostasis. Examples are animals eating food, rain falling on a plant, or a person exercising, a person sunbathing, etc.. Show Mr. Porta – explain how picture represents homeostasis. Paste to poster.

Homeostasis Worksheet. HW Homeostasis Worksheet.

Homeostasis & Raisins Lab

Homeostasis Online Scavenger Hunt

DO NOW!!! https://www.youtube.com/watch?v=Svbf40z5obE Active and Passive Transport

How cells exchange materials! Cell membranes - semi-permeable – allow certain particles in and out of cell Passive transport – move across a cell membrane without the use of energy (ATP) Active transport – move across a cell membrane with the use of energy (ATP)

Passive Transport Diffusion - movement of molecules from high to low concentrations. The contents of the tea bag are at a high concentration. But when they enter the glass of water they move from their high concentration into the water, which has a low concentration. This is the process of diffusion. Another example is apple pie going into the over, then taking it out of the over and the smell spreads throughout the house. NO ENERGY IS NEEDED TO DO THIS. 18

Passive Transport Osmosis - diffusion of water through cell membrane Facilitated Diffusion - large molecules move in and out of cells through protein channels. 19

Active Transport (uses energy) Endocytosis – cell surround and enclose a particle in a vesicle to bring inside Exocytosis - particles are enclosed in a vesicle in a cell and released outside. 20

Endocytosis Exocytosis

How do cells exchange materials? Why are both active and passive transport necessary to move materials into and out of cells? They need both active and passive transport because passive transport moves small particles such as ions through the cell membrane or the channel protein. But large particles like glucose and hormones cant go though the channel or lipid bilayer. They must be packaged in a vesicle to enter the cell or leave the cell through endo or exo cytosis. 22

Activity Food Coloring Diffusion Demo Put a drop of food coloring in a beaker full of water Potato in Both Salt Water and Distilled Water lets see what happens. After showing the class that I put potato pieces into a beaker of salt water and a beaker or distilled water at the beginning of class show them what happened to the potato pieces at the end of class. This is an example of the process of osmosis, which is the diffusion of water. The potato piece in the salt water becomes soggy because it looses water and the potato piece in the water becomes hard because it gains water.

HW Complete the Osmosis Homework Worksheet

DO NOW!!! Match word to picture: Diffusion, Exocytosis, Endocytosis, & Active Transport

Cells – living - require energy for life functions Active transport needs energy (ATP)

How do cells get energy? By breaking down or creating food. So animals have to eat plants and other organisms to get energy ( glucose). Plants can make their own glucose, using the energy from the sun. 27

Photosynthesis Plants, algae, and some bacteria - make their own food Photosynthesis – using light energy (Sunlight) to create chemical energy that can be used for cell fuel 28

In sunlight – CO2 + Water are converted into – sugar + O Done in the chloroplasts. The reason plants can carry out photosynthesis is due to chloroplasts. Animals lack chloroplast and are incapable of doing photosynthesis.

Photosynthesis

Cellular Respiration Animals

Cellular Respiration Do you remember photosynthesis. Carbon dioxide and water made sugar, but in animals, who do cellular respiration

Photosynthesis Plants – use CO2 & give off O2. Animals (other organisms) – use O2 & give off CO2. Cellular Respiration

Photosynthesis Activity Chrome book game Type – Photosynthesis Game - in Google Browser Click the first link: http://www.biomanbio.com/GamesandLabs/Photo Respgames/phorespgame.html

HW Complete the Lesson Review on Page 61. Skip questions 5, 7 and 8.

Do Now!!! https://www.youtube.com/watch?v=pOs AbTi9tHw Mitosis Rap

How Cells Divide Cells – grow, divide, die – at different rates / reasons Eukaryotes - DNA copied before division Mitosis - division of the nucleus (DNA) Cytokinesis - division of the cytoplasm 37

Mitosis Cell division - forms two genetically identical cells Copied DNA - packaged as chromosomes Chromosomes (DNA) – separate evenly between each cell 38

Phases of Mitosis

Prophase Copied DNA condenses - forms chromosomes. Nuclear membrane disappears. Centrioles release spindle fibers that connect to chromosomes Move to opposite ends of cell

Metaphase Chromosomes - line up in middle of cell

Anaphase Chromosomes separate - cell elongates.

Telophase Nuclear membrane - reappears Chromosomes - not condensed anymore. Spindle fibers disappear.

Cytokinesis Division of the cytoplasm

Mitosis Phase Worksheet Match the picture to the phase & tell what's happening!

HW Complete the Mitosis worksheet using your notes and the diagram.