respiratory system
what's the main organ of the respiratory system?
the lungs
where dose the digestive system start?
the mouth
what dose the heart pump?
blood
what is the control centre of your body?
the brain
what cells defend your body?
white blood cells
what is the windpipe in the respiratory system called?
The trachea
how long is the small intestine?
32 feet
What is blood made of?
red blood cells, white blood cells, and platelets.
What is a nerve cell called?
neurons
what is the powerhouse of a cell?
the mitochondrion
what part of the lungs does gas exchange take place?
the alveoli
how long does it take for the digestive system to digestive food?
3 days
How does blood clot?
when a blood vessel is injured, involving the vessel narrowing, platelets forming a plug, and clotting factors creating a stable, semisolid mass
what happens when your nerves overload?
you get a stroke
how can your cells turn into cancer?
genetic mutations that disrupt their normal function
how long can you hold your breath before you die?
90 seconds
what disorder causes stomach acid to flow into the esophagus?
heartburn
how can the heart stop pumping?
How much does an average human brain weigh?
3 pounds
what do the letters in DNA stand for?
deoxyribonucleic acid
what disorder can cause inflamed airways shortness of breath?
asthma
how long can you go without eating?
1 week
how long is the blood vessel if laid end-to-end?
60,000 miles
how long is the nervous system if laid end-to-end?
45 miles.
how many cells make up a human body?
40 trillion