Which term means "blood in the chest"?
a. aerothorax
b. pneumothorax
c. hemothorax
d. gastrothorax

Astructural difference between the trachea and esophagus that prevents the trachea from collapsing is the presence of: a) smooth muscle b) skeletal muscle c) respiratory cilia d) rings of cartilage

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Not type of personal health monitor can calculate the number of calories a person burns. true or false?