Unit 2: Cells and Systems. Science 8. Topic 1: Characteristics of Living Things. Structure, Function and Organization. Characteristics of Living Organisms. Living organisms need energy, they get it from food Living organisms respond and adapt to their environment
4. Excretory System: Filters blood and removes wastes from system
5. Sensory Awareness (Nervous) System: Responds to changes in the environment to keep your body stable.
Filters waste materials
from the blood.
Kidneys are the
http://www.learnalberta.ca/content/sebr/index.html (virtual lab)
Cold: Shivering makes muscles quiver and generate heat. Hair stands on end because of small muscle contractions.
Heat: Blood vessels in your skin expand to increase blood flow to the surface and release heat- it’s why you get a red face when you run!
Increases heart rate, and thus blood flow. Blood is diverted away from the digestive system and towards muscles so they can obtain oxygen.
Feeling ‘afraid’ is a reaction based on your endocrine system and your nervous system.
Your nervous system (brain, spinal cord and nerves) send signals to your body parts in response to stimuli.
E.g. The doctor hits your knee with his small hammer – what happens?
http://www.learnalberta.ca/content/ngs/index.html?ID1=&action=v&video=humanbody1ps_naes.smil (nervous + endocrine)