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Systems Physiology I > blood pressure 1vdeck > Flashcards

blood pressure 1vdeck Flashcards

1
Q

Degree of constriction experienced by a blood vessel relative to…

A

… its maximally dilated state.

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2
Q

What is vascular smooth muscle?

A

vascular tone (vascular tonus).

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3
Q

Which units are used to measure blood pressure?

A
  1. Bar
  2. PSI (pound per square inch)
  3. mm Hg – millimetre of mercury
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4
Q

Define blood pressure?

A

pressure exerted by circulating blood upon the walls of blood vessels. Force applied to the vessel walls.

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5
Q

What is the flow rate of blood?

A

volume of blood flowing through a specific vessel – or organ – over a period of time (for example, L/min, mL/s, etc.)

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6
Q

Flow is directly proportional to…

A

… pressure gradient.

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7
Q

Flow is inversely proportional to …

A

… vascular resistance.

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8
Q

What is vascular resistance?

A

Frictional force that opposes the flow of a fluid.

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9
Q

increased change in pressure =

A

increased flow

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10
Q

Increased resistance =

A

decreased flow rate.

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11
Q

decreased resistance =

A

increased flow rate.

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12
Q

How can the body compensate for increased resistance?

A

Heart works harder to achieve a larger pressure gradient.

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13
Q

The flow rate of blood through a vessel is…

A

… the volume of blood passing through per unit of time.

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14
Q

The flow rate of blood through a vessel is directly proportional to…

A

… the pressure gradient (as the pressure gradient increases, flow rate increases).

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15
Q

The flow rate of blood is inversely proportional to …

A

… vascular resistance (as resistance increases, flow rate decreases).

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16
Q

Flow rate of blood through a vessel =

A

pressure gradient / resistance of blood vessel.

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17
Q

What causes resistance to blood flow?

A
  1. Blood viscosity
  2. Vessel dimensions
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18
Q

What is blood viscosity?

A

The ‘thicker’ a liquid, the more viscous it is.

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19
Q

What about vessel dimensins causes ressitance to blood flow?

A
  1. Vessel dimensions
    Length
    Radius

Blood ‘rubbing’ - the greater the contact area = the greater the resistance.

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20
Q

More blood in contact with the walls of a narrow vessel =

A

increased resistance - flow decreases.

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21
Q

Less blood in contact with the walls of a wide vessel =

A

decreased resistance. Flow increases.

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22
Q

Slight change in the radius of a vessel =

A

notable change in flow.

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23
Q

Poiseuille law

A

Flow = pi x pressure gradient x radius^4 / 8 x viscosity x length.

24
Q

Resistance is inversely proportional to…

A

… the fourth power of the radius.

25
Doubling the radius reduces resistance to...
1/6th its original value.
26
Flow is...
... 16 fold.
27
What is pulse pressure?
PP = systolic pressure – diastolic pressure (DP) in simple terms.
28
Pulse pressure represents...
It represents the force that the heart generates each time it contracts (Amount of pressure required to create the feeling of a pulse).
29
MAP = clinically defined as
Perfusion pressure.
30
MAP is normally between...
70 to 110 mmHg.
31
If MAP falls significantly...
organ will not receive enough blood flow -> resulting in ischemia.
32
Cross sectional area is related to...
... velocity.
33
Velocity is inversely proportional to ...
... cross sectional area.
34
What is cardiac output?
volume of blood pumped by the heart.
35
Cardiac output (CO) = ?
CO = Heart Rate X Ventricle Stroke Volume = dm3/min, L/min.
36
What is peripheral resistance?
resistance of arteries and arterioles to blood flow.
37
What results in changes in blood pressure?
Any factor causing a change in cardiac output or peripheral resistance will result in a change in blood pressure.
38
Factors affecting heart rate?
o2 and co2 Physical activity Hct Symp and parasymp activity body comp drugs dehydration adrenaline and other hormones adenosine and caffeine pH electrolytes prostaglandins.
39
Factors affecting heart rate (HR)?
Autonomic innervation Hormones fitness levels age.
40
What factors affect stroke volume?
Heart size Fitness levels gender contractility duration of contraction preload (EDV) Afterload (resistance).
41
How to calculate stroke volume?
Stroke volume (SV) = EDV - ESV.
42
How to calculate cardiac output?
Cardiac output (CO) = HR x SV.
43
What is vascular compliance?
Ability of a blood vessel wall to expand and contract passively with changes in pressure.
44
What is aortic aneurysm a result of?
of increased total peripheral resistance.
45
An increase in cardiac output leads to...
...an increase in the volume of blood contained in the aorta and an increase in mean arterial pressure when total peripheral resistance remains the same.
46
A constant cardiac output leads to...
... an increase in the volume of blood contained in the aorta and an increase in mean arterial pressure when total peripheral resistance increases.
47
Aortic aneurysms have a limited...
...vascular compliance.
48
Aortic aneurysm affect on aorta?
Enlargement (dilatation) of the aorta to greater than 1.5 times normal size.
49
Aortic aneurysm is often...
...asymptomatic -> high risk of death.
50
What are some occasional symptoms of aneurysms?
Occasionally, abdominal, back, or leg pain.
51
Aortic aneurysm most commonly located in...
... abdominal aorta, but can be located in the thoracic aorta.
52
Describe the distribution of blood within the circulation?
the greatest volume found in venous vasculature, where 70-80% of blood is found. For this reason, veins are referred to as capacitance vessels. The relative volume of blood between arterial and venous sides of the circulation can vary considerably depending upon total blood volume, intravascular pressures, and vascular compliance.
53
Blood distribution values?
vein = 65% arteries = 13% arterioles = 2% capillaries = 5% central blood volume = 15%.
54
What is central blood volume (CBV)?
Central blood volume (CBV) = blood in heart cavities + lungs + central arterial tree.
55
CBV increased during ...
... sympathetic stimulation.

Systems Physiology I (21 decks)

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