After traveling through the inferior or superior vena cava, deoxygenated blood flows to the:
A. right atrium
B. right ventricle
C. left atrium
D. left ventricle

Maintaining a healthy weight allows the respiratory system to work more effectively because a. oxygen is being delivered more adequately. b. the heart does not have to pump as forcefully. c. the capillaries are constricted. d. the lung capacity allows for small amounts of air.

Which term defines one's age as measured by how well the body is working? chronological age biological age social age mental age

Me with this i need to get the answer quickly.