BIOL422 Blood Pathways

for all questions, remember this is for a fetal pig, so there are multiple routes (even if one may be more preferred). the beginning of all four routes in this situation can be cross referenced with day 2. i’m kind of lazy, so i’d just point to the diagram i posted in the corresponding channel of the anterior blood system. remember also that the anterior and posterior vena cava connect to the right atrium, and blood that enters the right atrium can travel through the fetal circulatory system in either method; and, all of the routes below are dependent on this being a fetal pig due to specific adaptations.

in both 1 and 2, the first option below prefaces the route if the blood travels through the ductus arteriosus of the fetal pig. it is more likely to occur if the blood traveled downwards from the anterior vena cava. the second option prefaces the route if the blood travels through the foramen ovale and is more likely to occur if the blood traveled from the posterior vena cava and has an upwards trajectory.
1. anterior vena cava or posterior vena cava → right atrium → right ventricle → pulmonary trunk → ductus arteriosus → descending aorta
2. anterior vena cava or posterior vena cava → right atrium → foramen ovale → left atrium → left ventricle → aortic arch → descending aorta

the following steps are all specific to anatomy from day 3. i’m working on other things right now and don’t have my tablet nearby, but i can try to connect the old diagram to day 3 later (i probably won’t with day 4… that’s a lot of effort)

umm. tldr?

  1. starts with anterior vena cava → somehow exits the heart → descending aorta → EITHER:
    1. → anterior mesenteric artery → duodenum → jejunum → ileum (must start in duodenum)
    2. → coeliac artery → gastrohepatic artery → duodenum → jejunum → ileum
    • → continues through capillary beds of the small intestine → hepatic portal vein → liver → liver capillaries → hepatic veins → posterior vena cava → right atrium
  2. starts with anterior vena cava → somehow exits the heart → descending aorta → left external iliac artery → left common iliac artery → posterior vena cava → right atrium
  3. posterior vena cava → somehow exits the heart → descending aorta → left umbilical artery → placenta → umbilical vein → EITHER:
    1. liver capillaries → hepatic veins
    2. ductus venosus
    • → continues through posterior vena cava → right atrium
  4. posterior vena cava → somehow exits the heart → descending aorta → EITHER anterior mesenteric artery or posterior mesenteric artery → large intestine → capillary bed of the large intestine → hepatic portal vein → liver → liver capillaries → hepatic veins → posterior vena cava → right atrium

okay so funnily enough i think all of these questions are just based on information from days 2 and 3, so if you can figure out how to follow a drop through specifically the anterior and posterior circulatory system, you’re good :FarThumbsUp: all of these are multistep questions which follow a drop of blood over the long term; i would break these down into sections and map out each one mentally to solve them.