Science test!!! Well I have a diagram of the heart. And it has little arrows of where the blood flows--but my question is WHERE DOES IT START? The pulmonary artery, the pulmonary veins, vena cava, WHAT?? HELP WiLL BE MUCHH APPRECIATED!!!
Thankkyouu. :]
2006-11-05 08:53:55 · 3 answers · asked by PALLAVii C 1 in Science & Mathematics ➔ Biology
While both answers are technically correct, being a closed loop, the circuit of blood flow cannot really be said to start anywhere, anymore than it can be said to stop at any point.
2006-11-05 09:31:51 · answer #1 · answered by John S 2 · 0⤊ 0⤋
All the veins in your body ends up in the vena cava. The vena cava leads the blood into the right atrium, trough the tricuspid valve the blodd gets to the right ventricle. From the right ventricle it goes to the pulmonary artery tho the lungs where it is saturated. When it's saturated its goes to the left atrium via the lung veins, from the left atrium it goes to the left ventricle and is then pumped out to your body via the aorta.
2006-11-05 09:06:11 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The systemic circuit starts at aorta, the oxygenated blood is delivered to all organs of the body, deoxygenated and goes back to heart via vena cava; next it goes thru right ventricle to the right chamber (atrium) flowing into pulmonary arteries and it is where the pulmonary circuit starts. More detailed info you can find at
http://en.wikipedia.org/wiki/Circulatory_system
http://www.accessexcellence.org/AE/AEC/CC/heart_anatomy.html
http://training.seer.cancer.gov/module_anatomy/unit7_3_cardvasc_blood3_pathways.html
and labeled diagrams you will find at
http://www.mscd.edu/~biology/Bio1000/heart.jpg
http://www.vaughns-1-pagers.com/medicine/heart-diagram.htm
2006-11-05 09:14:30 · answer #3 · answered by Judith 2 · 0⤊ 0⤋