Human Blood Vessels (Page 2 of 2) in pdf

Part C: Special Circulations- Hepatic Portal Circulation

1. What is the source of blood in the hepatic portal system?

2. Why is this blood carried to the liver before it enters the systemic circulation?

3. The hepatic portal vein is formed by the union of the __(a)___, which drains the __(b)____,

____(c)__, ___(d)____, and the __(e)____ (via the interior mesenteric vein), and the

__(f)____, which drains the __(g)___ and __(h)____. The ___(i)__ vein, which drains the

lesser curvature of the stomach, empties directly into the hepatic portal vein.

4. Trace the flow of a drop of blood from the small intestine to the right atrium of the heart,

noting all structures encountered or passed through on the way.

Part C: Arterial Supply of the Brain and the Circle of Willis

1. Branches of the internal carotid and vertebral arteries cooperate to form a ring of blood

vessels encircling the pituitary gland, at the base of the brain. What name is given to this

communication network? What is its function?

2. What portion of the brain is served by the anterior and middle cerebral arteries?

3. Both the anterior and middle cerebral arteries arise from the ____ arteries.

4. Trace the usual pathway of a drop of blood from the aorta to the left occipital lobe of the

brain, noting all structures through which it flows. Aorta

________

______

_______

________

left occipital lobe.

Part D: Fetal Circulation

1. The failure of the two of the fetal bypass structures to become obliterated after birth can

cause congenital heart disease, in which the youngster would have improperly oxygenated

blood. Which two structures are these?

2. Copy the following table to your paper. For each of the following structures, indicate its

function in the fetus. Circle the blood vessel that carries the most oxygen-rich blood.

Structure

Function in Fetus

Umbilical artery

Umbilical vein

Ductus venosus

Ductus arteriosus

Foramen ovale

3. What organ serves as a respiratory/digestive/excretory organ for the fetus.

Human Blood Vessels Page 2