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The Cardiovascular System: Blood Vessels

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The aorta is an example of an _______.
Elastic artery
Modified capillaries that are lined with phagocytes are called ________.
Sinusoids
Which tunic of an artery contains endothelium?
Tunic Intima
Which arteries carry deoxygenated blood?
Pulmonary Arteries
Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation?
Tunic Media
The outermost layer of a blood vessel is the tunica intima. True or False
False
Gas and nutrient exchange occur in the:
Capillaries
Which vessels carry blood away from the heart?
Arteries
Which statement best describes arteries?
All carry blood away from the heart
The arteries that are also called distributing arteries are the ________.
Muscular Arteries
The arteries that directly feed into the capillary beds are called ________.
Arterioles
Leaky capillaries found in the bone marrow are called_________.
Sinusoidal Capillaries
Which of the following is true about veins?
Veins have valves; arteries do not
Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of ______
Capillaries
A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the capillaries. True or False
True
_____ is the pressure that propels blood to the tissues.
Mean Arterial Pressure
Which of the following will lower blood pressure?
Atrial Natriuretic Peptide
Which of the following is NOT an important source of resistance to blood flow?
Total Blood Volume
Peripheral resistance ________.
Increases as blood viscosity increases
An increase in blood viscosity will cause an increase in peripheral resistance. True or False
True
Why is it important that blood pressure drop to lower levels as it reaches the capillary beds?
Capillaries are fragile and extremely permeable
Which of the following is directly involved in long-term blood pressure regulation?
Renal mechanisms
The pulse pressure is ________.
systolic pressure minus diastolic pressure
Factors that aid venous return include all except ________.
Urinary output
Which of the following would experience a decreased blood flow during exercise?
kidneys
Which of the following would experience an increased blood flow during exercise?
skin
Which of the following would not move by diffusion across a capillary into the surrounding tissue?
Proteins
Arteries supplying the same territory are often merged with one another, forming arterial anastomoses. True or False
True
The pancreas is an example of an organ with arteries that do not anastomose. True or False
False
Which of the following chemicals does not help regulate blood pressure?
Nitric Acid
Aldosterone will ________.
Promote and increase in blood pressure
The baroreceptors in the carotid sinus and aortic arch are sensitive to which of the following?
Changes in arterial pressure
Hypotension is generally considered systolic blood pressure that is below 100 mm Hg.
True
Osmotic pressure is created by the presence in a fluid of small diffusible molecules that easily move through the capillary membrane. True or False
False
Veins only carry oxygen deficient blood.
False
The circulatory route that runs from the digestive tract to the liver is called ________.
Hepatic portal circulation
The hepatic portal vein ________.
Carries nutrient-rich blood to the liver
Arterial pressure in the pulmonary circulation is much higher than in the systemic circulation because of its proximity to the heart. True or False
False
The cerebral arterial circle (circle of Willis) is an arterial anastomosis. True or False
True
What do the ductus arteriosus and the foramen ovale become at birth?
ligamentum arteriosum; fossa ovalis
The term ductus venosus refers to ________.
a special fetal vessel that allows umbilical blood to bypass the liver