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A&P II > Week 2 Heart > Flashcards

Week 2 Heart Flashcards

(83 cards)

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1
Q

What are the different types of pipes?

A

Arteries, veins, and capillaries.

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2
Q

What is an artery?

A

Blood vessel that carry blood AWAY from the heart

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3
Q

What is a vein?

A

A blood vessel that carry blood TOWARDS the heart.

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4
Q

What are capillaries?

A

Connect arteries to veins.

Smallest blood vessel

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5
Q

Where does exchange take place?

A

Capillaries

Where blood is moved out to cells or from cells into the blood

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6
Q

Where does the heart sit?

A

In the mediastinum (space between the lungs)
Just behind the sternum
Just anterior to vertebral column

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7
Q

How much of the heart is to the left of midline?

A

2/3 of heart

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8
Q

Why is it useful for the heart to be between the sternum and vertebral column?

A

For CPR

You can squish it artificially due to something solid in front and behind it.

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9
Q

What happens to the proportion of body weight made up of the heart as they get older?

A

It decreases

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10
Q

At birth, the heart makes up ___ of body weight?

A

130

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11
Q

In an adult, the heart makes up ___ of body weight?

A

1/300th

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12
Q

The shape of the heart tends to mirror what?

A

The shape of the thoracic cavity

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13
Q

What does apex mean?

A

Bottom point of the heart

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14
Q

What does base mean?

A

Top part of the heart

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15
Q

Where are all the major blood vessels enter and exit from?

A

The base of the heart

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16
Q

What is the heart surrounded by?

A

Protective sac called pericardium

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17
Q

Does the pericardium stretch? Y/N

A

NO

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18
Q

What is the layer attached/touching the heart?

A

Visceral pericardium

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19
Q

What is the layer outside the visceral pericardium?

A

Parietal pericardium

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20
Q

What is the space between the visceral pericardium and parietal pericardium?

A

Pericardial space

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21
Q

What is found in the pericardial space?

A

Pericardial fluid

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22
Q

What is the visceral and parietal pericardia TOGETHER called?

A

Serous pericardium

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23
Q

What is the outermost layer of the heart called?

A

Fibrous pericardium

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24
Q

What is in between the fibrous and parietal pericardium?

A

Space with little fluid but NOT pericardium fluid

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25
How much pericardial fluid in between the visceral and parietal pericardium?
10-15 ml of pericardial fluid
26
What happens if the serous pericardium overproduce pericardial fluid?
We can’t stretch fibrous pericardium. Heart gets squashed if there’s too much fluid.
27
What are one of the physical properties of a fluid?
You can’t compress it.
28
What is it called if you have inflammation in the pericardial space?
Pericarditis
29
What is cardiac tamponade?
When someone has an injury to the heart and blood can get out and into the pericardial space. Causes a decrease how effective heart can function.
30
What is the groove that runs around the base of heart where blood vessel attach?
Coronary sulcus
31
What is the coronary sulcus?
Coronary sulcus is a groove in between the atria and ventricles in the heart
32
What is a coronary sinus?
part of a blood vessel
33
Why are there some fat on the heart?
Provides cushion and protection for blood vessels as heart expands and contracts
34
What are the three layers of the heart wall?
Epicardium, myocardium, and endocardium
35
The epicardium and the ___ are the same thing
Visceral pericardium
36
What is the epicardium?
Thin covering that attaches to the muscle beneath it (myocardium) by a thin layer of areolar connecting tissue.
37
What is the myocardium?
Thickest layer, muscle of the wall of the heart, it does the work. Built to have sheets running in diff directions so we can contract in all directions
38
What is the lining of the heart called?
Endocardium
39
What does endocardium line with?
Continuous with the lining of the blood vessels, endothelium
40
What are the flaps and valves of the heart covered with?
Endocardium
41
Is cardiac muscle striated?
Yes It has sarcomeres
42
What is different about cardiac muscle tissue?
The cells are connected to each other with intercalated discs.
43
What do you find in an intercalated disc? This means what?
Gap junction An action potential can travel from one cardiac muscle cell into the next one, sodium can move through gap junctions
44
What do you describe the myocardium as?
Functional syncytium
45
What is a functional syncytium?
They function like one really big cell
46
What is the reason for functional syncytium?
We want myocardium, in particular areas of the heart, to have all the cells to contract at the same time.
47
What is the difference between cardiac muscle and skeletal muscle?
Cardiac muscle is autorhythmic
48
Why is cardiac muscle autorhythmic?
Cardiac muscle cells have their own inherit rate of depolarization at threshold They don’t need an action potential from a nerve to start depolarization, so they don’t need it for contraction.
49
Why DONT we need action potential from the nervous system?
to start depolarization and lead to a contraction?
50
Why do we need nervous system input?
to adjust the contraction and how much time between contractions or how forcefully we need the muscle to contract.
51
What is another difference between cardiac and skeletal muscle cells?
- Cardiac muscle cells are much SMALLER. - have only ONE nucleus - sometimes cells branch to help wrap myocardium around a space
52
What are desmosomes? And what is the purpose?
Connect 2 cells They are there to strengthen connection. Help hold myocardium together. As well as on either side of sarcomeres, NOT inside.
53
What is behind the aorta?
A section of myocardium that separates the RA from the LA called interatrial septum.
54
Where does the blood from the myocardium go back into?
Comes back into the RA from a different vessel.
55
What is the RA and RV separated by?
A class of cardiac valve called atrialventricular valve or AV valve.
56
What is the valve between the right atrium and the right ventricle called
Tricuspid valve - has three flaps on valve
57
Where do you ONLY see pectinate muscle?
Right atrium
58
What is the chordae tendineae?
It attaches at one end to the loose part of flap for tricuspid valve, the other end attached to the papillary muscle.
59
What is the papillary muscles part of?
Myocardium
60
When does the papillary muscle contract?
it contracts when rest of right ventricle contracts.
61
What does the chordae tendineae and papillary muscle do?
Keeps from opening backwards - prevents back flow
62
How does blood move?
There is a pressure gradient. Blood will always move where pressure is HIGHER to where pressure is LOWER.
63
Physiology of blood going back into right atrium from right ventricle.
As blood pressure in ventricle is higher, it will try to go back into the right atrium due to it being lower pressure. Flaps in valve catch it and chordae tendineae and papillary muscle keep valve from opening the other way so blood can’t go back from ventricle to atrium.
64
How are the valves operated by?
The pressure gradient
65
If the pressure after the valve is HIGHER than before, what does the valve do?
It closes
66
What is the innermost part of the muscle myocardium?
Trabeculae cardinae
67
What is the job of trabeculae cardinae ?
The only muscle of myocardium that’s actually contracting to pull in rather than push in. Gets myocardium moving
68
What does the moderator band do?
Part of conducting system (electrical system of heart) which helps carry signal to the free wall of right ventricle.
69
What is between the left ventricle and right ventricle?
Interventricular septum
70
What is the job of the right ventricle?
To pump blood to the lungs
71
What is not associated with the interventricular septum?
Free wall of the right ventricle
72
What is between the ventricles and blood vessels they pump blood into?
Semilunar valve
73
Do blood vessels pump blood?
No they carry blood
74
Difference between tricuspid valve and pulm valve?
No chordae tendineae in semilunar valves
75
Where does the left ventricle pump blood into?
aorta
76
What is another semilunar valve between LV and aorta called ?
Aortic valve
77
Parts of aorta
Ascending aorta, aortic arch, descending aorta
78
What is different from the right and left ventricle?
left ventricle has a thicker free wall
79
Why is the wall of the left ventricle thicker than right ventricle?
The right ventricle is pumping against a much lower blood pressure than left ventricle. - pressure to pump blood into aorta is higher than to pump blood in lungs Right ventricle is not pumping as far, only to lungs while left ventricle pumps to everywhere else
80
What is the normal arterial blood pressure in left ventricle pumping against
120/80
81
What is the normal arterial blood pressure in right ventricle pumping at peak?
25-30 mm of Mercury
82
What is the skeleton of the heart made up of?
Made of connective tissue, NOT bone.
83
What is the cardiac muscle attached to?
The four rings that make up the cardiac skeleton so it has something to pull against.

A&P II (17 decks)

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