blood vessels unit 2 part 2
what is a factor that is caused by muscle contraction?
an increase in venous return
what percentage of systemic capillaries are there?
what basic factor occurs when you increase blood pressure?
your blood flows quicker
what basic factor occurs when you decrease blood pressure?
less oxygen is being circulated through so your blood is flowing slower
what is resistance? and what does it do to blood flow?
resistance is the act of blocking something and stopping the process. it slows the blood flow down in the blood vessels.
what happens when the diameter of a blood vessel is decreased?
the peripheral resistance is increased
how often, theoretically, do the blood vessels in the body grow in length?
about once a year, they do not grow as often as daily but can grow more often depending on growth spurts or weight gain.
true or false: the length of a blood vessel can result from increasing weight gain?
what is the resulting end to the turbulence factor in the blood vessels?
what does a clot do to resistance?
true or false: ripples in the blood caused by clotting turbulence can lower the resistance in a blood vessel?
false: a smooth, straight path blood vessel can cause resistance levels to decrease.
what happens to the blood vessels as they travel farther away from the heart?
they shrink in diameter
why does the pressure start to decrease at the arterioles?
because at the arterioles, more vessels become available to dispense blood through.
how does the decrease in pressure at the arterioles affect the velocity of blood flow?
it decreases factors in the capillaries because the resistance is so high (the capillaries need time to exchange).
what happens to velocity in once pressure is lost in the capillary beds?
it increases to make up for the loss of resistance.
what is the main function of Capillary Hydrostatic Pressure (CHP)?
to drive stuff out of the blood
what two numbers are significant in the blood pressure of capillaries?
35 and 18
what is net filtration?
the filtration of stuff exiting the circulatory system
what molecules are present in capillaries as they move through the capillary beds?
what is the constant pull of BCOP?
how many liters of blood do we lose daily?
how many liters of blood do we input?
why don't we die from the pure and simple fact we dont input the amount of blood we output?
the lymphatic system
what reacts to an increase in blood pressure?
where are the baroreceptors found?
the medulla oblongata
what is a result of decrease in cardiac output?
a decrease in blood pressure (vasodilation)
what organ helps to control blood pressure that is not in the same area as the cardiovascular/ respiratory systems?
the kidneys! by osmoregulation!
what can be assumed by a decrease in pH level in a patient's blood?
their blood is more acidic that normal
what 3 factors result in homeostasis in the carotid and aortic sinuses?
02, co2, and pH
what is the general definition of blood flow?
the volume of blood flowing through a vessel, organ, or entire circulation in a given period of time
what are venules?
venules are formed when capillaries converge and allow fluid and WBC to move easily through blood and tissues.
what percentage of total blood volume can be attributed to venules?
blood vessels unit 2 part 2
quick references to the basic physiology of the blood vessels and the regulation of blood pressure.