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 has greatest effect on blood flow?
The three most important factors affecting resistance are blood viscosity, vessel length and vessel diameter and are each considered below. Blood viscosity is the thickness of fluids that affects their ability to flow.
Which of the following has the greatest effect on blood flow Physioex?
Which of the following has the greatest effect on blood flow? blood vessel radius.
What has the greatest effect on blood viscosity?
The addition of formed elements to plasma (red cells, white cells, and platelets) further increases the viscosity. Of these formed elements, red cells have the greatest effect on viscosity. In the figure, the relative viscosity at 0% hematocrit (plasma without cells) is about 1.8 as shown by the y-intercept.
Which of the following has the greatest impact on vascular resistance?
Radius of the arterioles is the most important factor, affecting vascular resistance, and it is regulated by systemic and local factors: Systemic factors include: Arterial baroreflex control (increased BP leads to a decrease in SVR. Peripheral and central chemoreceptors (hypoxia leads to increased SVR)
Which of the following is directly proportional to blood flow?
Which of the following is directly proportional to blood ﬂow? You correctly answered: blood vessel radius and pressure gradient.
What would be the effect on blood flow if some arteries lost their elasticity?
What would be the effect on blood flow if some arteries lost their elasticity? … increased blood flow because of a more rigid structure.
What is the driving force for blood flow?
Blood flow is driven by the difference in total energy between two points. Although pressure is normally considered as the driving force for blood flow, in reality it is the total energy that drives flow between two points (e.g., longitudinally along a blood vessel or across a heart valve).
Why does changing vessel radius have the greatest effect on blood flow?
Blood vessel radius is more likely to change because blood vessel length tends to stay pretty constant. Explain the effect that the changes in blood vessel length had on flow rate? The longer the vessel length, the greater the resistance, therefore increasing the vessel length decreases flow rate.
How does the body increase the blood vessel radius?
How does the body increase the blood vessel radius? You correctly answered: smooth muscle relaxation. You correctly answered: vessel radius.
What are the three important sources of resistance to blood flow?
What are the three important sources of resistance? Blood viscosity, total blood vessel length, blood vessel diameter. What factors remain relatively constant in resistance? Blood viscosity, and blood vessel length.
What is the relationship between blood flow and resistance?
Resistance is a force that opposes the flow of a fluid. In blood vessels, most of the resistance is due to vessel diameter. As vessel diameter decreases, the resistance increases and blood flow decreases.
What will be the result if there’s a reduction in blood flow to the body?
Over time, reduced blood flow in your extremities can cause: numbness. tingling. nerve damage.
What are the two major factors affecting blood flow rates?
What are 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.
What is the most significant source of blood flow resistance?
|what is the most significant source of blood flow resistance?||blood vessel diameter|
|the velocity of blood flow is?||slowest in the capillaries because of the total cross sectional area is the greatest|
What are the two factors that affect blood flow?
You need to know the factors that affect blood flow through the cardiovascular system: blood pressure, blood volume, resistance, disease and exercise.