Which of the following is the shortest event in a cardiac cycle?

Stimulation of sympathetic nerves to the heart decreases

During the cardiac cycle, aortic valve closes at the end of

The best measure of left ventricular preload is

During severe exercise, a well-trained athlete may be able to achieve a cardiac output of

The mechanism that regulates cerebral blood flow during cerebral compression is the

In ECG the depolarization of atria is indicated by

The Bainbridge reflex refers to

Cardiac output is determined by

An electrocardiogram is a graphic illustration of

These factors decrease the coronary blood flow EXCEPT

Pulmonary circulation differs from systemic circulation

Starling's law of the heart states that the strength of contraction is proportional to

All of the following parameters are increased during moderate exercise EXCEPT

Conduction speed is slowest in the

Normally, which of the following events in the cardiac cycle occurs at some point between S1 and the following S2?

The most appropriate index of left ventricular afterload is

All of the following are physiological factors affecting blood pressure except

Blood pressure increases and heart rate decreases in response to

In the heart, parasympathetic stimulation causes all of the following effects EXCЕРТ

These factors increase the coronary blood flow EXCEPT

All these statements are true about cardiac output EXCEPT

The cardiac reserve refers to the increase than can be attained in the

The maximal coronary blood flow occurs during the

Central venous pressure (CVP)

The phase of cardiac cycle at which the heart is not responsive

Increased pressure within the carotid sinus causes

Normally, the largest part of the blood volume is found in

With respect to the human heart

Regarding initiation and propagation of cardiac impulse, all are true EXCEPT

Venoconstriction

Regarding the functional structure and arrangement of the cardiovascular system,all are true EXCEPT

Contractile response of cardiac muscle

Regarding veins, all are true EXCEPT

Regarding the transmission of the cardiac impulse through the heart

The slowest conduction velocity is in the

A decrease in AV-node conduction velocity will

Characteristic features of cardiac muscle fibers are all of the following EXCEPT

Cardiac muscle cannot be tetanized because

The Frank-Starling law of the heart shows a direct relationship between stroke volume and

Contractile response of cardiac muscle

Regarding myocardial contraction

Concerning myocardial contractility, all are true EXCEPT

An increase in contractility is demonstrated in is demonstrated in a Frank Starling relationship

Regarding cardiac contraction

Starling law of the heart

Regarding sympathetic stimulation of the heart, all are true EXCEPT

Stimulating the parasympathetic nerves to the heart results in

Sympathetic stimulation of the heart causes all EXCEPT

Ventricular escape occurs during sever vagal stimulation because the

During the isometric contraction phase of cardiac cycle, the ventricular volume

During cardiac cycle in normal human

During the cardiac cycle, all are true EXCEPT

Regarding the cardiac cycle, all are true EXCEPT

With respect to the cardiac cycle, all are true EXCEPT

During atrial systole of the cardiac cycle

Ventricular filling

During isovolumetric ventricular contraction

As regards the heart sounds

Which of these factors increases central venous pressure (CVP)

Central venous pressure (CVP)

Central venous pressure (CVP) may be lowered by all of the following EXCEPT

CVP is raised by all EXCEPT

The second heart sound differ from the first heart sound in that

The first heart sound occurs synchronously with

Splitting of the second sound into two audible components in healthy people

It would be not true to say about venous pressure in the

Normal ventricular depolarization

Regarding pace maker potential

The SA node is the normal pace maker because it

The plateau of ventricular action potential coincides with which part of ECG

Normal repolarization of the ventricles usually begins in the area close to

In an ECG recording, the time between atrial depolarization and ventricular depolarization is represented by the

Concerning the ECG of an adult human, all are true EXCEPT

Concerning the ECG

Suppression of activity in the SA node of a normal heart result in

At a heart rate of 72 beats per minutes, the longest ECG interval would be

In the ECG, the T wave is associated with

A person's ECG has no P wave, but a normal QRS and T wave, his pacemaker is located in

An ECG shows no p waves in any leads. This indicates that impulses fromwhich one are blocked

Which of the following statements about the ECG is true

One of the following statements about the ECG is incorrect

In normal ECG

In the ECG

The electricocardiographic lead aVR is best described as

which of the following is true statement

Venous return is enhanced during exercise by all of the following EXСЕРТ

Regarding homeometric regulation of cardiac output, all are true EXCEPT

With reference to heterometric regulation of cardiac output, all are true EXCEPT

Heterometric regulation of cardiac output

Cardiac output is decreased

The stroke volume (SV) is likely to decrease

During muscular exercise, the cardiac output is increased above the permissive limit of the heart by

The venous return to the heart is decreased by

Which of the following would tend to increase stroke volume

Which of the following statements describes the homeometric autoregulation of stroke volume

All of the following are characters of heterometric autoregulation of stroke volume EXCEPT

Heart rate is accelerated by

Prolonged athletic training produces, in the resting state