Questions From Vieira Flashcards Preview

Sem 1- Physiology > Questions From Vieira > Flashcards

Flashcards in Questions From Vieira Deck (60):
1

How much blood does the atria eject inside of the ventricle after contraction?

20%

2

Why is the beginning of systole is called Isovolumic contraction?

Because all valves are closed and the volume doesn't change

3

Which part of the cardiac cycle is longer?

Diastole

4

Which blood vessel carries blood from the right ventricle to the lungs?

Pulmonary artery

5

Which valves are present in the right side of the heart?

Tricuspid and pulmonary

6

Which valves are located on the left side of the heart?

Mitral and aortic valve

7

T/F. Blood flows from pulmonary veins flows into the right atrium

False

8

The first heart sound is consequence of:

Closing of the AV valves

9

The second heart sound is a consequence of:

Closing of semilunar valves

10

What cells represent a cell that normally generate automatic rhythmical electrical discharge?

-SA node cells
-AV node cells
-Purkinje cells

11

T/F. Myocardial cells are uninflected, branched and interconnected by intercalated disks

True

12

What type of junctions do Intercalated disks have?

Gap junctions, desmosomes

13

Which cells have the faster conduction velocity: AV node cells, Myocardial cells, Purkinje cells?

Purkinje cells

14

The myocardial contraction depends on calcium derived from:

ECF and SR

15

Why is the SA node the normal pacemaker?

Because discharge faster

16

T/F The AV node is responsible to speed the velocity of the impulse for a rapid ventricular contraction

False

17

Why are the pacemaker NA channels funny?

Because they close during an AP

18

The plateau phase of the AP in myocardial ventricular cells is a result of:

-Opening of slow Ca channels
-Closing of fast K channels

19

What is the meaning of the "A" wave of the Wiggers diagram?

-Increased pressure secondary to atrial contraction

20

In which part of the Wigger's Diagram does the aortic pressure increase?

Ventricular Ejection

21

Preload is the same as________

End diastolic volume

22

An increase in cardiac muscle fiber length____________.

Increases the contractile force

23

An increase in contractility __________________

Decrease end-systolic volume

24

Which type of receptor is involved in the ionotropism stimulated by catecholamines?

Beta adrenergic

25

If a stenosis of the aortic valve is present, which consequence do you expect?

Increase in afterload

26

What part of the nervous system is directly responsible to increase the HR?

Sympathetic system

27

What transports blood under high pressure?

Arteries

28

What has the highest capacitance?

Veins

29

T/F The greater the cross sectional area of a vessel, the greater the velocity of blood flow.

False

30

Difference between the highest and the lowest pressure during a cardiac cycle is called _________.

Pulse pressure

31

What is true about MAP? (3 things)

1) Influenced by cardiac output
2) Increase in total peripheral resistance increases MAP
3) It is the most significant blood pressure

32

T/F. If the MAP increases Sympathetic output decreases.

True

33

___________ are responsible for information processing and coordination of an appropriate response for the Baroreflex

Brain stem

34

The increase in parasympathetic activity ___________________.

Decrease HR

35

Which centers participate in the Baroreflex response: (3)

-Vasoconstrictor center
-Cardiac accelerator center
-Cardiac decelerator center

36

The RAAS system is firstly activated by ________ present in the walls of afferent arterioles of the kidney.

Mechanoreceptors

37

The increase in ADH ____________

Increase BP

38

T/F. The stimulation of the RAAS system decreases total peripheral resistance and cardiac output

False

39

A positive ionotropic effect= __________

Increase contractility

40

What predominates in the heart? Sympathetic or Parasympathetic tone?

Parasympathetic tone

41

A positive Chronotropic effect ___________.

Increase HR

42

Which adrenergic receptor predominates in the heart?

Beta 1

43

Which vessel controls the precapillary sphincter?

Metarterioles

44

Which pressure favors filtration at the level of the capillaries?

BP

45

A severe hypoproteinemic puppy, can develop edema/as cites primarily because of the __________.

Decreased oncotic pressure

46

What is a cause of an increase in the Interstitial fluid volume?

Impaired lymphatic drainage

47

Which pressure is greater at the venous end of the capillary?

Capillary oncotic pressure

48

What is a consequence of an increase MAP?

Inhibition of RAAS

49

If vasodilation occurs, the TPR _________.

Decreases

50

Which pressure favors reabsorption into the capillary at the venous side of the capillary bed?

Capillary oncotic pressure

51

What 3 phases happen during ventricular diastole?

1) Isovolumic contraction
2) Rapid inflow
3) Diastasis

52

T/F. When the tissue metabolic rate increases, the decrease in O2 and increase in w=vasodilator lead to increase in blood flow

True

53

how many phases of the cardiac cycle have AV valves and semilunar valves at the same time?

2

54

Neural and hormonal influences in the cardiovascular system are considered:

Extrinsic factors

55

In which period of the Wigger's diagram the aortic pressure increases?

Ventricular Ejection

56

What does the QRS complex represents?

Ventricular depolarization

57

What is not an example of vasoconstrictor molecule?

Nitric Oxide

58

The right atrial pressure is also called?

Central venous pressure

59

T/F. Filtration is the movement of guild from capillary plasma into the interstitial fluid

true

60

T/F The lymphatic system plays a key role in controlling protein conc. In the interstitial fluid.

True