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HW/ ch 20

Anatomy and Physiology = Bio 2020; CH 20

The two pairs of major veins that drain the blood from the head and neck are the external and internal jugular veins. True
The cephalic, cystic, and brachial veins are responsible for draining most of the blood from the upper limbs. False
The median cubital vein is often used as a site for drawing blood from a patient. True
Capillary exchange is the process by which cells receive everything they need to survive and to eliminate metabolic waste. True
By far the most important means by which capillary exchange occurs is filtration. False
A small amount of fluid moves out of capillaries at their venous ends, and most of that fluid reenters the capillaries at their arterial ends False
Filtration pressure is the force responsible for moving fluid across capillary walls. True
Edema can be caused a result of which event(s)? Hypertension, causing an increase in tissue fluid at the arteriolar ends of capillaries. Increased tissue protein concentration, causing a decrease in osmosis of interstitial fluid into capillaries.
Edema can be caused a result of which event(s)? cont. Decreased plasma protein concentration, causing a decrease in osmosis of interstitial fluid into capillaries. Obstruction of lymphatic vessels, blocking lymphatic drainage.
In both pulmonary and systemic circulation, gas exchange occurs at the capillaries
Blood pressure is highest in the ___________ and lowest in the _____________. arteries closest to the heart, veins
Capillaries have only a tunica intima
The vessels that are responsible for carrying blood away from the heart are arteries.
Under the microscope, the wall of a blood vessel is observed to contain only a tunica intima. This must be a(n) capillary.
During exercise, blood is shifted from the __________ into systemic circulation. veins
Under the microscope, a blood vessel is observed to have a relatively thin wall, a large lumen, is collapsed, and contains a thick tunica externa. This is probably a(n) vein.
Four main arterial branches emerge from the aortic arch. False
If blood flow in the capillaries was too fast, there might not be sufficient time for exchange of nutrients and waste between tissues and blood. True
Hyaline cartilage has a low degree of vascularization. This means that blood delivery to this tissue is limited.
The thyroid gland is highly perfused. Therefore, it has a ______ degree of vascularization. high
When a vessel is damaged, local prostaglandins may be released and cause vasodilation to help prevent further blood loss. False
Local control of blood flow is achieved by the periodic relaxation and contraction of precapillary sphincters regulating blood flow through the tissues True
Precapillary sphincters relax as the tissue concentration of nutrients, such as oxygen, glucose, amino acids, and fatty acids, increases. False
Vasodilator substances are produced in the extracellular fluid as the rate of metabolism increases. True
During inflammation, __________ may be released and act as a vasodilator. histamine
Which vessel drains capillaries? Postcapillary venules
Deoxygenated blood from the heart myocardium drains into the right atrium via the coronary sinus.
Vasodilation increases blood flow and decreases blood pressure.
Created by: svalde1907