blood vessels true/false
true
A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the capillaries.
true
An increase in blood viscosity will cause an increase in peripheral resistance.
true
An obstruction in the superior vena cava would decrease the flow of blood from the head and neck to the heart.
false
Arterial pressure in the pulmonary circulation is much higher than in the systemic circulation because of its proximity to the heart.
true
Arteries supplying the same territory are often merged with one another, forming arterial anastomoses.
true
Every minute, about 1.5 ml of fluid leaks out of the capillaries.
true
Hypotension is generally considered systolic blood pressure that is below 100 mm Hg.
true
In infants and young people, congenital vascular problems are less common than congenital heart disease
false
Osmotic pressure is created by the presence in a fluid of small diffusible molecules that easily move through the capillary membrane.
true
The adjustment of blood flow to each tissue in proportion to its requirements at any point in time is termed autoregulation.
true
The azygos vein originates in the abdomen.
true
The carotid sinus reflex protects the blood supply to the brain, whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole.
true
The cerebral arterial circle (circle of Willis) is an arterial anastomosis.
false
The first major branch of the femoral artery is the dorsalis pedis artery.
true
The most common form of shock is hypovolemic shock
false
The outermost layer of a blood vessel is the tunica intima
false
The pancreas is an example of an organ with arteries that do not anastomose.
true
The pulmonary circulation does not directly serve the metabolic needs of body tissues.
false
The thick-walled arteries close to the heart are called muscular arteries.
false
Vasodilation is a widening of the lumen due to smooth muscle contraction.
true
Whereas diffusion is more important for solute exchange between plasma and interstitial fluid, bulk flow is more important for regulation of the relative volumes of blood and interstitial fluid.
