What differences between the atria and ventricles could u feel with your finger?

Question

1.into what chamber of the heart do the anterior and posterior vena cava open?

2. from what chamber does the aorta arise?

3.to what structure do the pulmonary arteries lead?

4. why does the ductus arteriosus close off at the time of birth?

5.what is the funcation of the cornonary circulation?

6. What the result when coronary circulation is prevented?

Please help and thx a lot, this is about Fetus Pig dissection

Answer 1

AWWWW POOR PIG!

i dont get how anyone would have a heart to disccet anything (no pun intended)

1. the vena cava go into the right artery

thats all I knoww

Answer 2

Ventricles much thicker and bigger than atria. Also inside of ventricles very rugged whereas atria are smoother. Ventricles have fibres from the valves going into them.

4. In the fetus most blood bypasses the lungs as it receives its oxygen from the maternal circulation via the umbilical cord. Once the animal is born it needs blood to go through the lungs for oxygen therefore the ductus closes.

Answer 3

1 right atrium

2left ventricle

3lung

4because of smooth muscle contraction

5/6 coronary circulation supplies heart and occlusion of circulation to heart causes ischemia which in turn results in vrious pathologies example infarction /angina