answered graded A+
The aorta is an example of a(n):
a) arteriole.
b) vein.
c) elastic artery.
d) muscular artery. - correct answer ✔✔ c)
Which arteries carry deoxygenated blood?
a) aorta
b) pulmonary arteries
c) carotid arteries
d) renal arteries - correct answer ✔✔ b)
T/F: The outermost layer of a blood vessel is the tunica intima. - correct answer ✔✔ False
What type of tissue is found in the walls of the arteries that leave the heart but not in the walls
of the large veins that enter the heart?
a) endothelium
b) smooth muscle
c) elastic tissue
d) collagen fibers - correct answer ✔✔ c)
,T/F: Vasodilation is a widening of the lumen due to smooth muscle contraction. - correct answer
✔✔ False
Which of the following would decrease peripheral resistance to blood flow?
a) Vasoconstriction
b) Increasing blood vessel length
c) Atherosclerosis
d) Anemia - correct answer ✔✔ d)
Which capillaries are the most common in the body?
a) sinusoids
b) anastomoses
c) continuous capillaries
d) fenestrated capillaries - correct answer ✔✔ c)
T/F: A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the
capillaries. - correct answer ✔✔ True
Which of the following is NOT an important source of resistance to blood flow?
a) blood viscosity
b) vessel diameter
c) vessel length
d) total blood volume - correct answer ✔✔ d)
Which of the following will lower blood pressure?
a) Aldosterone
b) Angiotensin II
, c) Atrial natriuretic peptide
d) Antidiuretic hormone - correct answer ✔✔ c)
Why is it important that blood pressure drop to lower levels as it reaches the capillary beds?
a) capillaries actually need a higher blood pressure for filtration activities
b) capillaries are fragile and extremely permeable
c) capillaries actually are high pressure vessels
d) capillaries depend on the lower pressure to prevent fluid exchange between the capillaries
and the tissue fluid - correct answer ✔✔ b)
________ pressure is the difference between systolic and diastolic pressure. - correct answer
✔✔ Pulse
Which of the following would experience a decreased blood flow during exercise?
a) Skin
b) Kidneys
c) Brain
d) Skeletal muscles - correct answer ✔✔ b)
Which of the following blood pressure readings would be indicative of hypertension?
a) 110/60 in a 20-year-old woman
b) 170/96 in a 50-year-old man
c) 120/80 in a 30-year-old man
d) 140/90 in a 70-year-old woman - correct answer ✔✔ b)
Aldosterone will ________.
a) result in a larger output of urine