Which statement is CORRECT concerning capillaries? O The walls of capillaries contain smooth muscle. O The only site of nutrient, gas, and waste exchange. O Networks of capillaries are called...

Extracted text: Which statement is CORRECT concerning capillaries? O The walls of capillaries contain smooth muscle. O The only site of nutrient, gas, and waste exchange. O Networks of capillaries are called capillary nets. O Pre-capillary sphincters contract to increase capillary flow. O Almost all capillaries are open at the same time.


Extracted text: A newborn was delivered through normal spontaneous vaginal delivery (NSVD). After the umbilical cord was cut, the number of arteries and vein was checked. You are aware that umbilical vein carries O oxygen and nutrients from the fetus to the placenta O oxygen and nutrients from the placenta to the fetus O metabolic wastes and carbon dioxide from the fetus to the placenta O blood from the navel into the inferior vena cava O metabolic wastes and carbon dioxide from the placenta to the fetus 5 7 8 9. 10 11 12 13 14