Font size
WorksheetsCh.18 Hemodynamics quiz
Total questions: 57
Worksheet time: 5hrs 45mins
The study of blood moving through the circulatory system
(a)
The volume of blood moving during a particular time, answers the question "How Much?"
(a)
Units for Flow
Volume / Distance
Distance / Time
Volume/ Time
Volume x Time
The speed or swiftness of a fluid moving from one location to another, answers the question- "How Fast? "
(a)
Units for Velocity
distance x time
distance / time
distance / volume
volume / time
3 forms of blood flow are..
Phasic
Steady
Parabolic
Pulsatile
Occurs when blood moves with a variable velocity, Blood accelerates and decelerates as a result of cardiac contraction
(a)
Pulsatile Flow is most commonly seen in
Venous Circulation
Arterial Circulation
Present when individuals stop breathing
Occurs when blood moves with a variable velocity, blood accelerates and decelerates as a result of respiration
(a)
Phasic flow is most commonly seen in
Venous Circulation
Arterial Circulation
Present when the individual stops breathing for a moment
When a fluid moves at a constant speed or velocity
(a)
Steady flow is most commonly seen in
When the individual stop breathing for a moment
Arterial Circulation
Venous circulation
When the flow streamlines are aligned and parallel
(a)
When all of the layers and blood cells travel at the same velocity
(a)
Flow when the velocity is highest in the center of the lumen and gradually decreases to its minimum at the vessel wall
(a)
Predicts whether the flow is laminar or turbulent
(a)
Flow characterized by chaotic flow patterns in many different directions and at many speeds
(a)
The type of flow often associated with cardiovascular pathology, seen downstream from a significant stenosis in a vessel
(a)
Sound associated with turbulence
(a)
Tissue vibration associated with turbulence that can be felt with the fingertips
(a)
The Reynold's Number that predicts Turbulent Flow
1500 < x > 2000
<1500
>2000
When blood moves from regions of higher energy to lower energy
(a)
Which event provides energy to the circulating blood?
Contraction of the heart during systole
Relaxation of the heart during diastole
Energy associated with a moving object
(a)
Kinetic energy is determined by 2 factors
(a)
Stored energy that has the ability to do work
(a)
stored energy that is associated with any elevated object
(a)
Describes the thickness of a fluid
(a)
_ energy is lost with movement of _ viscosity fluids
More / high
Less/ High
More/ Low
Viscosity units
(a)
% of blood made up of red blood cells
(a)
Normal value of hematocrit in healthy patients
25%
50%
45%
75%
With anemia, hematocrit is _ and blood has a _ viscocity
increased/ high
reduced/ low
increased/ low
reduced/ high
Occurs when flow energy is converted to heat as one object rubs against another
Viscous Energy Loss
Gravitational Energy Loss
Inertial Energy Loss
Frictional Energy Loss
Tendency of an object to resist changes in its velocity
(a)
Energy lost when the speed of a fluid changes
(a)
Velocity _ as the vessel narrows
Increases
Decreases
Does not change
Where does maximum velocity exist in a vessel
Distal to a stenosis
At the beginning of the vessel
At the narrowest point
Proximal to the stenosis
The narrowing in the lumen of a vessel
(a)
Which is not an effect of stenosis
Change in flow direction
Decreased velocity as the vessel narrows
Turbulence proximal to the stenosis
Loss of pulsatility
Pressure gradient across the stenosis
Describes the relationship between velocity and pressure in a moving fluid
(a)
Pressure gradient increases when
Flow increases
Resistance decreases
Resistance Increases
Flow decreases
Flow increases when
Pressure gradient decreases
Resistance increases
Resistance decreases
Pressure gradient increases
Pressure gradient = __ x __
(a)
When venous inflow increases during exercise, the vein changes from:
Hourglass to Round to Oval
Round to Hourglass to Oval
Round to Oval to Hourglass
Hourglass to Oval to Round
Pressure related to the weight of blood pressing on a vessel measured at a height above or below heart level
(a)
Units of hydrostatic pressure
(a)
In a supine individual what is the hydrostatic pressure
0 mmHg
50 mmHg
-30 mmHg
100 mmHg
At locations below the heart level, such as the ankle, the hydrostatic pressure is?
Zero
Positive
Negative
At locations above the heart, such as the ear, the hydrostatic pressure with be?
Negative
Zero
Positive
What happens during inspiration?
Thoracic Pressure decreases
Diaphragm moves upward into thorax
Abdominal pressure increases
Venous return to the heart increases
Venous flow in the legs increases
What happens during Expiration?
Diaphragm moves downward into the thorax
Thoracic pressure increases
Abdominal pressure decreases
Venous return to the heart increases
Venous flow in the legs increases
What best describes veins?
Low pressure, high resistant
Low pressure, low resistant
High pressure, high resistant
High pressure, low resistant
What happens to blood flow velocity when a vessel widens?
Increases
Decreases
Remains the same
Which type of energy loss occurs due to the viscosity of blood?
Frictional Energy Loss
Inertial Energy Loss
Viscous Energy Loss
What is the primary factor that determines the resistance to blood flow in a vessel?
Pressure gradient
Length of the vessel
Diameter of the vessel
Viscosity of the blood
The narrowing of blood vessels increases pressure and leads to a faster blood flow.
True
False
