Tag: cardiac cycle

Questions Related to cardiac cycle

Pulse is a direct measure of

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Blood pressure

  2. Cardiac output

  3. Stroke volume

  4. Heart rate.

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Correct Option: D

What will be the number of heart beats per minute, if the stroke volume of heart increases, with total volume of blood remains same

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Remains constant

  2. Decreases

  3. Increases

  4. Become erratic.

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Correct Option: B

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

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. AV valves open up

  2. Ventricular walls vibrate due to gushing in of blood from artia.

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

  4. AV node recives signal from SA node.

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Correct Option: C
Explanation:
During each cardiac cycle, two prominent sounds are produced which can be easily heard through a stethoscope. The first sound (lub) is associated with the closure of the tricuspid and bicuspid valves during ventricular systole to prevent the backflow of blood to atria. The second sound (dub) is associated with the closure of semilunar valves during ventricular diastole to prevent the backflow of blood to ventricles.

The rate of heart beat is determined by

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. SA node

  2. AV node

  3. Purkinie fibre

  4. Papillary muscles

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Correct Option: A

In which type of stole, does phloem surround the xylem both externally and internally?

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Amphiphloic siphonostele

  2. Ectophtoic siphonostele

  3. Haplostele

  4. Actinostle

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Correct Option: A

The rate conduction of impulse in the conducting system of heart is fastest in

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Atrial muscles

  2. Bundle of His

  3. Purkinje's fibres

  4. AV node

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Correct Option: A

State whether the following statements are true or false.
Human heart is neurogenic because the heart beat originates in the nodal tissues.

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. True

  2. False

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Correct Option: B
Explanation:

The heart is entirely made up of cardiac muscles. Muscle cells are also called myocytes. The control of the heart function is by a set of muscles or special node of the modified heart muscle, the sinoatrial node (SAN) located in the atria, so the heart is, therefore, called myogenic.

So, the correct option is 'False'.

State whether the following statements are true or false.
The first heart sound results from a closure of semilunar valves.

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. True

  2. False

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Correct Option: B
Explanation:

Heart sounds are noises generated by the closing and opening of the heart valves. In a healthy individual, there are two normal heart sounds called lub and dub. Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole. The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.

So, the correct option is 'False'.

In heart, automatic rhythmic impulse generation capability is present in the

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. S.A. node

  2. A.V. node

  3. Bundle of His

  4. All of the above

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Correct Option: D
Explanation:
The human heart is a muscular structure made up of involuntary cardiac tissues. The pacemaker of the heart or the SA node generates an electrical impulse that travels across the heart muscles and results in a heartbeat. Sometimes activity of SA node is decreased  by vagus cranial nerve then AV node, Bundle of His and Purkinje fibres together provide Autorhythmicity to the heart.

So, the correct answer is 'All of the above'.

Heart sound which is longer is

biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

  1. Lubb

  2. Dub

  3. Both are equal

  4. Sometimes (a) and sometimes (b).

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Correct Option: A