Tag: human heart

Questions Related to human heart

Which of the following can't be taken as an example of parasympathetic stimulation:

biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. Increase in the intestinal peristalsis

  2. Increased secretion of gastric juice

  3. Contraction of the detrusor muscles of urinary bladder.

  4. Increase in ventricular force of contraction.

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Correct Option: D
Explanation:
Increase in vertricular force of contraction is not an example of Parasympathetic stimulation because its function is to slow the heart rate of person.

When does the blood enter in Atria. Choose the correct:-
(a) During generation of impulse from SAN
(b) Atrial relaxation
(c) As the tricuspid and bicuspid valves are open 
(d)Joint diastole

biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. a,b

  2. a, b, c

  3. b, c, d

  4. all

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Correct Option: A
Explanation:

Heart has two ventricles and two atria, left and right respectively. Deoxygenated blood enters the left atrium through superior & inferior vena cava, when the atria relaxes, blood enters into it, whereas impulse from SA node causes contraction of atria which leads to the flow of blood into ventricles.

Thus, the correct answer is 'a,b.'

The volume of blood pumped out by the two ventricles of human heart per minute is 

biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. $5L$

  2. $10L$

  3. $15L$

  4. $20L$

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Correct Option: A

Which of the following is responsible to allow the flow of blood due to contraction of right ventricle ?

biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. Aorta

  2. Lymph Vessels

  3. Veins

  4. Blood Vessels

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Correct Option: A

Pulmonary trunk originate from?

biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. Right Atrium

  2. Left Atrium

  3. Left ventricle

  4. Right ventricle

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Correct Option: A
Explanation:

The pulmonary trunk is a significant human blood vessel from the right ventricle. It branches into the pulmonary arteries of the right and left that lead to the lungs.

So, the correct answer is 'Right Atrium'

During the rhythmicity of heart beat, the impulse of cardiac begins at _________.

biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. A.V. Node

  2. S.A. Nod

  3. Bundle of His

  4. Purkinje fibres

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Correct Option: A

The cardiac impulse is initiated and conducted further upto ventricular. The correct sequence of conduction of impulse is?

biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. SA node, AV node, Purkinje fibre, AV bundle

  2. SA node, Purkinje fibre, AV node, AV bundle

  3. SA node, AV node, AV bundle, Purkinje fibre

  4. SA node, Purkinje fibre, AV bundle, AV node

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Correct Option: A

The dorsal aorta arise from :- 

biology transport in mammals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. Left ventricle

  2. Right ventricle

  3. Left atrium

  4. Right atrium

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Correct Option: A

'Bundle of His' is a part of which one of the following organs in humans?

biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. Pancreas

  2. Brain

  3. Heart

  4. Kidney

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Correct Option: C
Explanation:

The bundle of His is a collection of heart muscle cells, specialized for electrical conduction, that transmits the electrical impulses from the AV node (located between the atria and the ventricles) to the Purkinje fibers, which provide electrical conduction to the ventricles.

Purkinje fibres are present in

biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

  1. Ventricles

  2. Auricles

  3. Striated muscle fibre

  4. Throughout the heart

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Correct Option: A
Explanation:

The Purkinje fibres are located in the inner ventricular walls of the heart, just beneath the endocardium in a space, called as the subendocardium. These fibres consist of specialized cardiomyocytes, that are able to conduct cardiac action potentials.

So, the correct answer is option A