direction:read each question carefully and choose the letter of the correct answer
_1.what is the primary function of the respiratory system?
a.breathing b.circulation c
c.digestion d.movement
_2.what human body system is responsible for the distribution of food nutrients and oxygen throughout the body?
a.circulatory b.nervous
c. respiratory d.skeletal
_3.what type of blood cell protect your body from infection due to disease -causing microorganisms?
a.plasma b.platelets
c.red blood cells d.white blood cells
_4.what is a circulatory system n
a.the body 's breating system
b.the body 's system of nerves
c. the body's food processing system
d.the body's blood transporting system
_5.what is the funtion of the tonsils
a.they vibrate in order to produce sound
b.they prevent food from entering the windpipe
c.they warm and moisten the air that enter throung the nose
d.they trap and destroy the bacteria that enters throung the nose and the mount
_6.what happens during inhalation
a. air rushes out of the lungs
b.tge rebs and diaphragm realx
c.the ribs and diaphagm contact
d.the chest cabity become smaller.
_7.when does choking happen
a.when the epiglottis is pressed down the opening of the larnyx to prevent from entering
_8.why is the heart important
a.it stops the flow of blood
b.it checks the flow of blood
c. it occumpies the chest cavity
d it pumps the blood to move throughout the body
_9.why is blood important to the body?
a.it gives color to our skin
b.it carries oxygen and nutrients to diffent cells of the body
c it carries away carbon dioxide and other wastes from the body
d.b and c
_10.why are platelets important to the body
a.they give the blood its red color
b.they carry oxygen to all parts of the body
c.they sorround the germs an weaken them
d. they make the blood clot to stop continues bleeding​