the structure and function of blood vessels

Question 1

what are the three blood vessels

Answer 1

veins, capillaries and arteries

Question 2

describe the route the blood takes through the body

Answer 2

blood circulates from the heart to the arteries to capillaries then to veins and back to the heart

Question 3

describe the effect the route blood takes on blood pressure

Answer 3

leaves the heart in arteries under high pressure and returns to heart in veins at low pressure

Question 4

describe the structure and function of arteries

Answer 4

carry blood away from heart at a high pressure

outer wall of elastic fibers and inner wall of smooth muscle with some elastic fibers and a relatively narrow lumen

Question 5

explain vasoconstriction

Answer 5

smooth muscle in arteries contracts causing a decrease in blood flow into capillaries

Question 6

explain vasodilation

Answer 6

smooth muscle surrounding arteries relaxes causing an increase in blood flow into capillaries

Question 7

explain how materials are exchanged between tissue fluid and cells

Answer 7

capillaries are found in capillary beds which run through cells of body tissues. blood is at a high pressure which causes pressure filtration to occur. this results in capillaries exuding plasma which becomes tissue fluif that bathes the cells and supplies them with glucose and oxygen.

Question 8

explain the function of the lymphatic vessels

Answer 8

excess fluid that does not return back to the blood during pressure filtration enters the lymphatic vessels as lymph which returns to the circulatory system