In the 4th week, the _____________ is positioned at the top of the primitive atrium.

Click the area of the sinus venosus. 

Actin filaments, which are essential in muscle contraction, are an example of what type of cytoskeletal filament?

The ___________ forms the right ventricle.

In fetal circulation, what connects the pulmonary artery to the aorta?

By birth, the normal heart rate is ___________ beats per minute. 

What is the final shunt called during the division of the primitive atrium?

If the foramen ovale remains open after birth, click the area where we would see a defect.

Once the baby is born, blood pressure will immediately ___________ in the newborn’s IVC and RA. 

Prior to week ____, the heart is a pair of tubes sitting on either side of the midline of the embryo.