Cardiac Output

Q.

The cardiac output is measured by _____.

1. Heart rate minus stroke volume

2. Heart rate plus stroke volume

3. Heart rate multiplied by stroke volume

4. Heart rate divided by stroke volume

Q.

Which of the following is not true about the heart’s conduction system?

1. Other muscles receive impulses through the neurons from the brain, but heart produces its own potential

2. The SA node generates action potentials higher than all the other parts of the conducting system.

3. The SA node generates specifically 70 action potentials per minute.

4. If all the other portions of the conducting system other than the SA node, produce action potentials at a much slower rate, it would maintain our heart rate.

Q.

The (i)___, controls both the heart rate and the stroke volume. There are two separate nerves from the cardiovascular centre to the sinoatrial node: the (ii)___, to speed up the heart rate and the (iii)___, to slow it down. These two receptors receive information from special cells called (iv)___, present in the aortic arch and in the carotid sinus.

1. (i)Cardiac centre, (ii) Parasympathetic system, (iii)Sympathetic system, (iv) Baroreceptors

2. (i)Cardiac centre, (ii) Sympathetic system, (iii)Parasympathetic system, (iv)Baroreceptors

3. (i)Baroreceptors, (ii) Sympathetic system, (iii)Parasympathetic system, (iv)Cardiac centre

4. (i)Sympathetic system, (ii) Baroreceptors, (iii)Cardiac centre, (iv)Parasympathetic system

Q. What is the approximate amount of blood pumped by each ventricle of the heart during one cardiac cycle?

1. 100 ml
2. 50 ml
3. 80 ml
4. 70 ml

Q.

Cardiac output is defined as

1. heart rate times stroke volume

2. Peripheral resistance times heart rate

3. Blood pressure minus peripheral resistance

4. Blood pressure times peripheral resistance

Q. The volume of blood present in an adult human is_____

1. 1 litre
2. 2 litres
3. 5 litres
4. 10 litres

Q.

Doctors use stethoscope to hear the sound produced during each cardiac cycle. The second sound is heard when:

1. AV node receives signal from SA node

2. AV valves open up

3. Ventricular walls vibrate due to the gushing of blood from atria.

4. Semilunar valves close down after the blood flows into vessels from ventricles.

Q. explain the role of conducting system in heart?

Q. The stroke volume multiplied by the ___ gives cardiac output

1. blood pressure
2. heart rate
3. cardiac cycle
4. pumping efficiency

Q.

The cardiac output is measured by _____.

1. Heart rate minus stroke volume

2. Heart rate plus stroke volume

3. Heart rate multiplied by stroke volume

4. Heart rate divided by stroke volume

Q. Read the following statements:
(i) During a cardiac cycle, both ventricles pump out approximately $70\text{ml}$ of blood called stroke volume.
(ii) Cardiac output can be defined as volume of blood pumped out by both ventricle per minute.
(iii) Cardiac output of an athlete will be higher than that of an ordinary man.
(iv) During each cardiac cycle two prominent sounds are produced.
How many statements are correct?

1. Three
2. One
3. Two
4. Four