today we are going to learn about systems in the body systems are groups
of organs or body parts that work together to do a job in this video we
will talk about the nervous system the circulatory system the respiratory
system and the digestive system
your nervous system controls your whole body it's made up of your brain spinal
cord and nerves that go through your body to let you see smell taste hear and
feel nerves move information from your body to your brain have you ever touched
something hot you probably jerk back before you even knew what you were doing
your nerves send a message of hot ouch to your brain and your brain responded
really fast to keep you from getting hurt your brain does more than just
control how your body moves it also stores memories and things you need-to-know
helps you sleep and breathe and keeps your heart beating and processes
information it's like a big computer that runs your whole body
your circulatory system moves blood around your body blood carries oxygen to
all the cells in your body to keep them alive your heart pumps blood blood
vessels carry blood to and from the heart the vessels that carry blood away
from the heart and to other parts of your body are called arteries the
vessels that return blood to your heart are called veins when the blood returns
to your heart it gets a fresh supply of oxygen before circulating back through
your body
the respiratory system provides oxygen to your body there are several different
parts to the system but the lungs are the main organ in the respiratory system
an organ is a special body part that serves a function in the respiratory
system you breathe in air through your nose or mouth that air comes into your
lungs the oxygen from the air you breathe goes into your blood and you
exhale carbon dioxide from your lungs over and over every day you breathe in
new air and expel carbon dioxide from your lungs
the digestive system breaks down food to provide you with energy and nutrients
the beginning of your digestive system is your mouth where you eat food
the food travels down your esophagus and into your stomach
and your stomach acids break down the food into little bits it moves into your
intestines your intestines pull all the nutrients out of your food leaving only
waste the waste moves through your system and out the other end
waste comes out of your body when you use the bathroom different organs in the
system help to remove and process nutrients so you can get all the good
stuff from your food
now you know a little more about how your body works can you think of ways
that these systems work together let's try to think of some remember how your
blood carries oxygen your blood gets oxygen from your lungs in order to get
the nutrients from food you have to eat how do you know when you should eat you
know because your brain tells you that you are hungry all of these systems have
to work together to keep you running playing and learning