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Cardiovascular system > Organisation of the CVS - L1 > Flashcards

Organisation of the CVS - L1 Flashcards

1
Q

Test book human - gender/weight/HR/BP?

A

70Kg Male
Resting pulse HR - 70bpm
BP - 120/80mmHg

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2
Q

What is the change of HR that it can be for example with exercise and training?

A

Magnitude of change e.g. from rest to strenuous exercise – HR can increase from 70bpm to 200bpm (3 fold)

Range: Rarely do we encounter a textbook person e.g. resting HR ranges from 60- 85bpm; potentially <30bpm with training

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3
Q

Risk factors for Cardiovascular disease? HINT 10

A
  1. High blood pressure
  2. Unhealthy diet
  3. High cholesterol
  4. Diabetes
  5. Tobacco
  6. Overweight and obesity
  7. Air pollution
  8. Kidney disease
  9. Physical inactivity
  10. Harmful use of alcohol
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4
Q

What are the 3 fundamental components of the CVS?

A

Heart, blood and blood vessels

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5
Q

How does the body ensure that the metabolic needs of all cells are met? Homeostasis wise

A

The circulatory system contributes to homeostasis by transporting O2, CO2, wastes, electrolytes, and hormones from one part of the body to another.

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6
Q

Most basic and important function of CVS system:

A

To provide adequate blood flow to all body organs and tissues

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7
Q

Single-celled organism - Amoeba system?

A

Simple - Relies on diffusion between it and the environment

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8
Q

CVS system protective function?

A

Blood clotting - protects against haemorrhage
Pathogens - immune system

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9
Q

CVS system regulation function?

A

Hormones and thermoregulation - skin blood vessels

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10
Q

Transport of substances: Respiratory?

A

O2+CO2

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11
Q

Transport of substances: Nutritive?

A

Absorbed products of digestion

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12
Q

Transport of substances: Excretory?

A

Metabolic wastes delivered to liver and kidneys

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13
Q

Transport of substances: Regulation and protection?

A

Hormones, immune cells, clotting proteins to specific target cells

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14
Q

Basic function of the heart?

A

Pumps blood at high pressure

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15
Q

Basic function of the blood?

A

Transport medium in which materials to be transported are dissolved or suspended.

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16
Q

Basic function of the blood vessels - vasculature?

A

Passageways to distribute blood to all parts of the body and return it to the heart.

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17
Q

What are the blood vessels? 5

A
  1. Arteries
  2. Arterioles
  3. Capillaries
  4. Venules
  5. Veins
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18
Q

On average, how much blood?

A

5-5.5L about 8% of body weight

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19
Q

What does blood consist of and % wise?

A

Plasma - 55% of total blood volume
Specialised cellular elements - 45%:
-RBCs: Erythrocytes
-WBCs: Leukocytes
-Platelets

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20
Q

Function of platelets?

A

Blood coagulation - clotting

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21
Q

Function of WBCs?

A

Immunity/defence

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22
Q

RBC function?

A

Transport O2

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23
Q

What is plasma made up of?

A

Water, dissolved solutes e.g. ions, plasma proteins, other components e.g. metabolites, hormones, enzymes, antibodies

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24
Q

Is the pump on-off?

A

Pump is on-off

25
1. Does pipe i.e. arteries and veins have a pressure gradient? 2. Pipe in diameter? 3. Do the walls of the pipe stretch? 4. Is the pipe leaky?
1. Pipe has a pressure gradient 2. Pipe varies in diameter 3. Walls of pipe can stretch in some places 4. Some parts of pipe are leaky
26
CVS comprises multiple serial components?
Two circulations/loops (both originating and terminating at the heart): Systemic circulation AND Pulmonary circulation
27
What is the systemic circulation?
Between the heart and all body systems. Supplies most organs and tissues
28
What is the pulmonary circulation?
Between the heart and lungs
29
Pump = heart, what is the systemic pump?
Left side - propels blood around the systemic circuit
30
Pump = heart, what is the pulmonary pump?
Right side - propels blood around the pulmonary circuit
31
Systemic circuit: 1. What kind of circuits? 2. Pressure in it? 3. Is the regulation independent?
1. The Systemic circuit is comprised of many parallel circuits. 2. It requires greater pressure for flow to many organs and is high pressure circuit, therefore, left heart is a stronger pump. 3. This Parallel flow allows independent regulation of blood flow to organs
32
Pulmonary circuit - high/low pressure circuit?
Low pressure circuit, therefore right heart is a weaker pump
33
Which side of heart is stronger - left or right?
Left: systemic circuit is stronger to the right side: pulmonary circuit
34
VEIN DIAGRAM
35
What is the Cardiac Output (CO)? Formula?
It is the volume of blood ejected by each ventricle of the heart each minute. CO = SV X HR
36
Factors in blood flow?
Pressure gradient and resistance
37
main component of blood?
Water
38
What is blood flow rate F?
The volume of blood passing through per unit time
39
Formula for F - flow rate?
F = Delta P/R Where F = flow rate of blood through a vessel Delta P = pressure gradient R = resistance of blood vessels
40
Is Flow rate proportional to pressure gradient and vascular resistance?
Flow rate of blood is directly proportional to the pressure gradient (P) and is inversely proportional to vascular resistance (R)
41
What is the pressure gradient?
The DIFFERENCE (Delat) in pressure between the beginning and the end of a blood vessel.
42
Where does circulation begin and end?
At the heart
43
Blood flows from an area of which pressures?
Blood flows from an area of high pressure to low pressure
44
What is resistance?
A measure of opposition/hindrance to blood flow through the vessel
45
What happens to flow rate when resistance increases?
As resistance increases, flow rate decreases. Pressure gradient must therefore increase correspondingly to maintain flow rate
46
Number of prevalent cases of CVS disease in the world in 2015?
422.7 million
47
What is F driven by ?
Flow rate is driven by properties of the heart and blood vessels
48
What does the heart provide in terms of driving F?
Heart provides pulsatile driving force (contracts-relaxes) i.e. it is a pump (on – off – on –off)
49
1. Heart input equals? 2. Venous return equals?
1. Heart input = Heart Output 2. Venous return = Cardiac ouput
50
another way to describe Cardiac Output?
how much blood leaves ventricles of heart per minute i.e. per beat It is both ventricles - but more focused on left side
51
What do blood vessels provide resistance to flow via?
Blood vessels provide resistance to flow via vessel radius
52
What is total peripheral resistance - TPR?
Total peripheral resistance (TPR) is the sum of the resistance of all peripheral vasculature (i.e. all organ circuits) in the systemic circulation.
53
Can the radius of arterioles be regulated? What is this important in controlling?
Yes the radius of arterioles can be regulated and is the key factor in controlling resistance to blood flow throughout the vascular circuit, and thus the distribution of CO.
54
CO proportional inversely/directly to MAP/TPR?
CO is proportional to MAP/TPR MAP = mean arterial pressure TPR = Total peripheral resistance CO = cardiac ouput
55
Which has a higher pressure - arteries/capillaries?
arteries have a higher pressure than capillaries
56
What happens if there is sub-optimal functioning of the CVS?
Sub-optimal functioning: disease results Diseases and disorders of heart and/or vasculature compromise blood flow to organs
57
How does the body ensure that the metabolic needs of all cells are met?
Through optimal functioning of the CVS Function integrated with that of other organ systems
58
can only eject what is being perceived arterioles do all the hard work - actually do the offloading of O2 into capillary that gets into organ vasodilation/constriction of arterioles can be regulated resistance in all vessels - high sugar/high fats diet widespread in vasculature system - doesn't just pick 1 vessel - affects the whole tree of the CVS all the way up to the heart. One may be more resistant than another but if 1 is diseased, all is diseased.
59
2022 figure of CVS disease in world and every year?
550 million living with it 16 million every year being diagnosed

Cardiovascular system (13 decks)

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