The human heart could compensate for flow rate changes
to maintain blood pressure by altering heart rate
. When the heart rate increases, so does blood pressure. When the heart rate decreases, so does blood pressure.
Which of the following has the greatest effect on resistance to blood flow?
The three most important factors affecting resistance are
blood viscosity, vessel length and vessel diameter
and are each considered below.
Which mechanism that you tested had the greatest compensatory greatest effect?
Contractility
had the greatest compensatory effect.
Which of the following has the greatest effect on peripheral resistance?
Peripheral resistance is determined by three factors: Autonomic activity:
sympathetic activity
constricts peripheral arteries. Pharmacologic agents: vasoconstrictor drugs increase resistance while vasodilator drugs decrease it.
How does the heart compensate for peripheral resistance?
Explain how the heart could compensate for changes in peripheral resistance?
An increase in peripheral resistance causes an increase in Heart Rate to try and keep the same volume of blood going through the vessels
. Peripheral resistance and HR are directly proportional.
When your heart does not function well how will it affect your body?
As your heart works harder, it may become weaker. Your
body gets less oxygen
, and you might notice symptoms like shortness of breath, swelling in your legs, and fluid buildup. Your body tries to keep the blood it has to supply your heart and brain. This leaves less for organs like your kidneys and liver.
What body systems are affected by heart failure?
CHF develops when your
ventricles
can't sufficiently pump blood to the body. Over time, blood and other fluids can back up inside other organs, including your lungs, liver, lower body or abdomen. This faulty pumping also means your body isn't receiving enough of the oxygen it requires.
What two factors will increase blood flow?
Any factor that causes cardiac output to increase, by elevating heart rate or stroke volume or both, will elevate blood pressure and promote blood flow. These factors include sympathetic stimulation, the
catecholamines epinephrine and norepinephrine, thyroid hormones
, and increased calcium ion levels.
What are the two major factors affecting blood flow rates?
- To increase pressure and reduce resistance.
- To equalize the blood flow with the pressure differences.
- To maintain adequate blood flow through peripheral tissues and organs.
- To equalize the stroke volume with the cardiac output.
Which blood vessels experience the sharpest decrease in blood pressure?
Which blood vessels experience the sharpest decrease in blood pressure?
skeletal muscle pumps
. You just studied 67 terms!
What has the greatest effect on blood pressure?
The pressure is greatest
when blood is pumped out of the heart into the arteries
. When the heart relaxes between beats (blood is not moving out of the heart), the pressure falls in the arteries.
Which blood vessels handle the highest blood pressure?
Blood pressure tends to be the greatest near the heart, and decreases as blood flows to the capillaries. The pressure is greatest at
the aorta
and gradually decreases as blood moves from the aorta to large arteries, smaller arteries, and capillaries.
Which of the following hormones will lower blood pressure?
Aldosterone
is a steroid hormone. Its main role is to regulate salt and water in the body, thus having an effect on blood pressure.
What are the three factors that influence peripheral resistance?
back | nextPeripheral Resistance
Peripheral resistance is determined by three factors:
Autonomic activity: sympathetic activity constricts peripheral arteries
. Pharmacologic agents: vasoconstrictor drugs increase resistance while vasodilator drugs decrease it. Blood viscosity: increased viscosity increases resistance.
What happens to blood pressure when peripheral resistance increases?
Blood pressure increases with
increased cardiac output
, peripheral vascular resistance, volume of blood, viscosity of blood and rigidity of vessel walls. Blood pressure decreases with decreased cardiac output, peripheral vascular resistance, volume of blood, viscosity of blood and elasticity of vessel walls.
Why are pressure changes not a good way to control blood flow?
Explain why pressure changes are not the best way to control blood flow. Your answer: because
pressure changes do not affect the flow rate as well as vessel radius or viscosity
. The changes in blood flow though pressure is not as significant. Use your data to calculate the increase in flow rate in ml/min/mm Hg.
