Chapter 20 Review Questions Flashcards
The endothelium is found in the
Tunica intima
Nervi vasorum control
Both vasoconstriction and vasodilation
Closer to the heart, arteries would be expected to have a higher percentage of
Elastic fibers
What best describes veins?
Thin walled, large lumens, low pressure, have valves
An especially leaky type of capillary found in the liver and certain other tissues is called a
Sinusoid capillary
In a blood pressure measurement of 110/70, the number 70 is the
Diastolic pressure
A healthy elastic artery
Is compliant
Which of the following statements is true?
As blood volume decreases, blood pressure and blood flow also decrease
Slight vasodilation in an arteriole prompts a
Huge decrease in resistance
Venoconstriction increases which of the following?
Blood pressure within vein, blood flow within the vein, and return of blood to the heart
Hydrostatic pressure is
The pressure exerted by fluid in an enclosed space
Net filtration pressure is calculated by
Subtracting the blood colloid osmotic pressure from the capillary hydrostatic pressure
Which of the following statements is true?
In one day, more fluid exits the capillary through filtration than enters through reabsorption
Clusters of neurons in the medulla oblongata that regulate blood pressure are known collectively as
The cardiovascular center
In the renin-angiotensin mechanism
Aldosterone prompts the kidneys to reabsorb sodium
In the myogenic response
Vascular smooth muscle responds to stretch
A form of circulatory shock common in young children with severe diarrhea or vomiting is
Hypovolemic shock
The coronary arteries branch off the
Ascending aorta
The coronary arteries branch off of the
Ascending aorta
Which of the following statements is true?
The radial and ulnar arteries join to form the palmar arch
Arteries serving the stomach, pancreas, and liver all branch from the
Celiac trunk
The right and left brachiocephalic veins
Drain blood from the right and left internal jugular veins, drain blood from the right and left subclavian veins, drain into the superior vena cava
The hepatic portal system delivers blood from the digestive organs to the
Liver
Blood islands are
Masses of pluripotent stem cells scattered throughout the fetal bone marrow
Which of the following statements is true?
One umbilical vein carries oxygen-rich blood from the placenta to the fetal heart
The ductus venosus is a shunt that allows
Most freshly oxygenated blood to flow into the fetal heart
