Exam 14:The Vascular System-Part B

In fetal circulation,the umbilical vein carries blood from the ___________________ to the ________________________.

In fetal circulation,the umbilical arteries carry blood from the __________________ to the ____________________________.

Capillaries are made of _______________________ tissue,and its important characteristic is its ____________________________.

Smooth muscle tissue forms the _______________________ layer of an artery,and its function is to ___________________________.

In the wall of a vein,the layer that is folded into valves is the _____________________.

Blood flow is slowest in ______________________,and this is important to permit __________________ for exchanges of materials.

During exercise,blood flow to the digestive tract will _____________________,and blood flow to the skin will __________________________.

The flow of blood into a capillary network is regulated by a(n)_______________________,which is made of ____________________________ tissue.

The hormone that raises blood pressure by increasing sodium and water reabsorption by the kidneys is ___________________________.

In fetal circulation,the foramen ovale permits blood to flow from the __________________ to the _______________________.

One purpose of hepatic portal circulation is to enable the liver to receive alcohol absorbed by the stomach and _____________________ it before blood reaches the ____________________.

In fetal circulation,exchanges between fetal blood and maternal blood take place in the ____________________________.

In hepatic portal circulation,blood from the ___________________ and the _______________ flows through the _________________ before returning to the heart.

The circle of Willis supplies the ___________________,and is an example of an arterial ____________________.

Veins are able to constrict because of the _________________________ tissue in their walls.

In capillaries,nutrients are brought out into tissues by the process of ___________________.

The blood pressure in pulmonary circulation is always __________________,to prevent filtration and accumulation of fluid in the ____________________.

Starling's law of the heart states that when cardiac muscle fibers are stretched,they will ______________________.

The flow of venous return is kept to one direction only by the ____________________ in the veins.

The venous return mechanism that is especially important for the veins of the legs is the ___________________________.