Which system is responsible for the transportation of blood throughout the system?

a. respiratory system

b. cirulatory system

c. digestive system

d. endocrine system

Which of the following is not a common cause for exercise related injury? a. overeating b. being dehydrated c. being active in an unsafe enviroment d. not wearing the proper clothes or protective gear

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

Name three bad things that can happen to a teenager who has no refusal skills and no self-control: