Flashcards in Questions From Vieira Deck (60):
How much blood does the atria eject inside of the ventricle after contraction?
Why is the beginning of systole is called Isovolumic contraction?
Because all valves are closed and the volume doesn't change
Which part of the cardiac cycle is longer?
Which blood vessel carries blood from the right ventricle to the lungs?
Which valves are present in the right side of the heart?
Tricuspid and pulmonary
Which valves are located on the left side of the heart?
Mitral and aortic valve
T/F. Blood flows from pulmonary veins flows into the right atrium
The first heart sound is consequence of:
Closing of the AV valves
The second heart sound is a consequence of:
Closing of semilunar valves
What cells represent a cell that normally generate automatic rhythmical electrical discharge?
-SA node cells
-AV node cells
T/F. Myocardial cells are uninflected, branched and interconnected by intercalated disks
What type of junctions do Intercalated disks have?
Gap junctions, desmosomes
Which cells have the faster conduction velocity: AV node cells, Myocardial cells, Purkinje cells?
The myocardial contraction depends on calcium derived from:
ECF and SR
Why is the SA node the normal pacemaker?
Because discharge faster
T/F The AV node is responsible to speed the velocity of the impulse for a rapid ventricular contraction
Why are the pacemaker NA channels funny?
Because they close during an AP
The plateau phase of the AP in myocardial ventricular cells is a result of:
-Opening of slow Ca channels
-Closing of fast K channels
What is the meaning of the "A" wave of the Wiggers diagram?
-Increased pressure secondary to atrial contraction
In which part of the Wigger's Diagram does the aortic pressure increase?
Preload is the same as________
End diastolic volume
An increase in cardiac muscle fiber length____________.
Increases the contractile force
An increase in contractility __________________
Decrease end-systolic volume
Which type of receptor is involved in the ionotropism stimulated by catecholamines?
If a stenosis of the aortic valve is present, which consequence do you expect?
Increase in afterload
What part of the nervous system is directly responsible to increase the HR?
What transports blood under high pressure?
What has the highest capacitance?
T/F The greater the cross sectional area of a vessel, the greater the velocity of blood flow.
Difference between the highest and the lowest pressure during a cardiac cycle is called _________.
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
T/F. If the MAP increases Sympathetic output decreases.
___________ are responsible for information processing and coordination of an appropriate response for the Baroreflex
The increase in parasympathetic activity ___________________.
Which centers participate in the Baroreflex response: (3)
-Cardiac accelerator center
-Cardiac decelerator center
The RAAS system is firstly activated by ________ present in the walls of afferent arterioles of the kidney.
The increase in ADH ____________
T/F. The stimulation of the RAAS system decreases total peripheral resistance and cardiac output
A positive ionotropic effect= __________
What predominates in the heart? Sympathetic or Parasympathetic tone?
A positive Chronotropic effect ___________.
Which adrenergic receptor predominates in the heart?
Which vessel controls the precapillary sphincter?
Which pressure favors filtration at the level of the capillaries?
A severe hypoproteinemic puppy, can develop edema/as cites primarily because of the __________.
Decreased oncotic pressure
What is a cause of an increase in the Interstitial fluid volume?
Impaired lymphatic drainage
Which pressure is greater at the venous end of the capillary?
Capillary oncotic pressure
What is a consequence of an increase MAP?
Inhibition of RAAS
If vasodilation occurs, the TPR _________.
Which pressure favors reabsorption into the capillary at the venous side of the capillary bed?
Capillary oncotic pressure
What 3 phases happen during ventricular diastole?
1) Isovolumic contraction
2) Rapid inflow
T/F. When the tissue metabolic rate increases, the decrease in O2 and increase in w=vasodilator lead to increase in blood flow
how many phases of the cardiac cycle have AV valves and semilunar valves at the same time?
Neural and hormonal influences in the cardiovascular system are considered:
In which period of the Wigger's diagram the aortic pressure increases?
What does the QRS complex represents?
What is not an example of vasoconstrictor molecule?
The right atrial pressure is also called?
Central venous pressure
T/F. Filtration is the movement of guild from capillary plasma into the interstitial fluid