Energy in Cells Betsy Sanford 7 th Grade
Energy in Cells Betsy Sanford 7 th Grade Life Science Lost Mountain Middle School
For each picture… – List all matter represented in the photo. – List all energy represented in the photo. – Explain how the matter and energy are interacting in the photo.
Types of Energy – Thermal (heat) - Sonic (sound) - Mechanical (motion) – Electromagnetic (radiation including visible light) - Nuclear (inside atoms) – Chemical (stored in the bonds between atoms) - Electrical – Photosynthesis starts with electromagnetic (radiation) energy and ends with chemical energy (glucose). – Cellular Respiration starts with chemical energy and ends with any or all of the following energy: thermal, mechanical, sound, chemical (ATP).
Cell Membrane • all cells have a cell membrane • it acts as a barrier between the inside and outside of the cell • it controls what goes in and out of the cell
Cell Wall • located on the outside of the cell membrane • it provides strength, structure and support to the cell • found only in plant and some bacteria cells
Cytoplasm • fluid inside the cell • acts like a shock absorber • keeps the organelles from bumping into one another
Vacuole • acts as a storage area for the cell • much larger in plants because plants make their own food and need large storage areas
Lysosome • collects wastes and worn out cell parts • breaks down the wastes for disposal
Nucleus • the control center of the cell • contains DNA • directs all of the cell’s activities • found in all cells except bacteria
Cell Energy - Photosynthesis • energy for life comes from the sun – either directly or indirectly • photosynthesis is the process plants, some bacteria and some protists like algae use to capture light and turn it into food • these organisms are called producers or autotrophs
Basic Food Chain
Basic Food Chain
Chloroplast • the place inside a cell where photosynthesis happens • found only in plants, some bacteria, and some protists • chlorophyll is the green pigment that soaks up light
Cell Energy – Cellular Respiration • animals, fungi, some bacteria, and some protists must consume other living things for energy • cellular respiration is the process these organisms used to breakdown food for energy • these organisms are called consumers or heterotrophs • producers also need to use energy • producers also have mitochondria to breakdown the food they make
Mitochondria • the place inside a cell where cellular respiration happens • found in all cells • all living things need to use energy
The Energy Cycle • the start of photosynthesis is the end of respiration • the start of respiration is the end of photosynthesis
Summary Questions 1. Why do cells have so many parts? What roles do those parts play in helping to keep the cell alive? How do the parts interact? 2. How do cell organelles work together to supply energy for the cell? 3. Why do producers have both chloroplast and mitochondria? 4. How do all living things get energy either directly or indirectly from the sun? 5. What are some ways to show the energy cycle in an illustration?
- Slides: 19
