15. What are tubes that carry blood back to the heart?
a. arteries
b. veins
c. pipes
d. tubes
16. What is the functional unit of the nervous system?
a. brain
b. neurons
c. muscles
d. bones
17. What controls and coordinates the activities of the whole nervous
system?
a. central nervous system
c. nervous system
b. sympathetic nervous system d. brain
18. Which of these is not a function of the peripheral nervous system?
a. collects information from the sense organ
b. transmits information to the central nervous system
c. delivers decisions to the body part which will perform the action
d. delivers oxygen to the different parts of the body
19. Which shows the correct order of food travelling through the digestive sys
is swallowed?
a. stomach, esophagus, large intestine, small intestine
b. small intestine, large intestine, esophagus, stomach
c. esophagus, stomach, large intestine, small intestine
d. esophagus, stomach, small intestine, large intestine​