science help?

Question

can someone tell me the differences between the inferior venacava and the pulmonary artery? and what are the reasons?

Answer 1

Animation of heart and arteries.
About Your Heart
Heart Animations and Interactives
http://www.smm.org/heart/heart/top.html

The inferior vena cava (or IVC) is the large vein ________________________
that carries de-oxygenated blood from the
lower half of the body into the heart.
_____________________________________
It is posterior to the abdominal cavity and runs along side of the vertebral column on its right side (i.e. it is a retroperitoneal structure). It enters the right atrium at the lower right, back side of the heart.
Pulmonary
Large blood vessel that carries blood away from the heart, towards the lungs, and supplies the large capillary network in lungs by which oxygen enters the blood.
The Pulmonary Artery is the only artery in the body that carries blood with low oxygen levels. Except for the Pulmonary Artery, all other arteries exclusively transport blood that contains high levels of oxygen
one carries blood to the heart from the lower half of the body
The other carries blood away from the heart

Answer 2

The inferior vena cava is a vein and it brings blood to the heart. The oxygen-poor blood from the lower part of your body flows into the inferior vena cava and from there enters your heart at the right atrium.

The pulmonary artery is an artery and it takes blood away from the heart. This artery is responsible for taking oxygen-poor blood from the right ventricle to the lungs (away from the heart) so it can be oxygenated before returning to the heart and being pumped out to the whole body.