Circulatory Sysytem
What organ is the pump in the circulatory system?
The heart
What organ does you use to breathe in oxygen?
Lungs
Name the three main parts of a plant
roots, stem, leaves
What four things do cells need?
food, water, gas exchange, waste disposal
Blood flows away from the heart in blood vessels called__________.
Arteries
What waste gas do you breathe out?
Carbon dioxide
These tubes carry water from the roots to the other parts of a plant
Xylem
What is the basic unit of life?
Blood flows back to the heart in vessels called ________.
Veins
Millions of air sacs in your lungs are surrounded by these vessels.
Capillaries
This system of tubes in plants carries sugars to all the cells that need it
Phloem
What is the process that breaks down large sugar molecules into molecules of water and carbon dioxide?
cellular respiration
The smallest blood vessels, the ones that serve the cells, are called ______________.
Capillaries
What cells pick up oxygen in the lungs?
Red blood cells
What three things combine to make sugar molecules in a plant's cells?
carbon dioxide, water, and energy from the Sun
This provides energy to cells.
Sugar
What are the two most important resources transported to cells by red blood cells? What is the most important waste product removed from cells by red blood cell?
oxygen and sugar ; carbon dioxide
Why does your heart beat faster and breathing quicken when you are exercising?
You use more energy so your heart must beat faster to carry the nutrients and oxygen needed to the cells and more waste is produced and needs to be removed quickly from the body.
The process that converts air, water and solar energy into sugars.
Photosynthesis
Leaf cells contain this molecule, which gives them their green color
chlorophyll