Blood Vessels Flashcards
Which of the following is an important characteristic of capillaries?
Blood flows through them slowly and exchange occurs quickly.
Georgia stands all day at her job. From what condition may she begin to suffer?
Varicose veins
Why does blood pressure increase durning exercise?
Heart rate increases, vascular resistance increases, stroke volume increases.
While standing in the hot sun, sally begins to feel light-headed and faints. Why?
Blood has pooled in her lower limbs, cardiac output has decreased, sending less blood to the brain, and sweating has reduced blood volume.
Trace blood from the aortic arch to the right thumb. A=Artery and V=Vein R=Right and L=Left
Brachiocephalic a. > R. subclavian a. > R. axillary a. > R. brachial a. > R. radial a. > palmer arches
Why is blood pressure higher in the aorta than in the inferior vena cava?
The diameter of the aorta is smaller and velocity of blood flow is also greater.
Why does most filtration take place at the arterial end of a capillary?
CHP is higher at the arterial end.
How is mean arterial pressure determined?
It is diastolic pressure + (pulse pressure divided by 3)
What event is happening if net filtration pressure is negative?
Reabsorption is occurring in a capillary.
Which statement below is NOT true with regard to atherosclerosis?
The presence of foam cells on the blood vessel wall prevent the plaque from sticking.
Although it is true that arteries carry_, it is NOT always true that they carry_ blood?
Blood away from the heart; O2 rich.
Why are valves located in veins, but not in arteries?
Because venous blood pressure is lower, and valves prevent back flow of blood.
The hepatic portal system delivers?
Nutrients to the liver.
In fetal circulation, what is the role of the ductus venous?
Collects blood from the veins of the liver and empties into the inferior vena cava.
Fenestrated capillaries are important_ because_?
In filtration areas of the kidneys; they allow rapid exchanges of water and solutes b/w plasma and interstitial fluid, and at the median eminence of the hypothalamus; they allow diffusion of regulatory hormones.
