Tag: cardiac cycle

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Questions Related to cardiac cycle

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cardiac impulse originates in the sinoatrial (SA) node, travels to the atrioventricular (AV) node, passes through the AV bundle (Bundle of His), and finally spreads through the Purkinje fibres to the ventricular myocardium. This ensures the coordinated contraction of the heart chambers.

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

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

  1. Pancreas

  2. Brain

  3. Heart

  4. Kidney
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Purkinje fibres are present in

  1. Ventricles

  2. Auricles

  3. Striated muscle fibre

  4. Throughout the heart
Reveal answer Fill a bubble to check yourself
A Correct answer
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

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

The pulmonary artery carries deoxygenated blood from the ........... to the lungs.

  1. Left ventricle

  2. Right ventricle

  3. Left auricle

  4. Right auricle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pulmonary circulation carries blood to and from the lungs. They include the pulmonary artery (aorta) and its branches to the capillaries in the lungs, as well as the veins, that drain those capillaries. The pulmonary arteries carry blood low in oxygen from the right ventricle, while the pulmonary veins carry blood high in oxygen from the lungs into the left atrium. This circuit functions to eliminate carbon dioxide from the blood and replenish its supply of oxygen.

So, the correct answer is option B.

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

Heart beat in vertebrates is

  1. Neurogenic

  2. Myogenic

  3. Both of the above

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Myogenic contraction refers to a contraction initiated by the myocyte cell itself.

In vertebrates, normal activities of the heart are regulated intrinsically, i.e., auto regulated by specialised muscles (nodal tissue). Hence, the heart is called as myogenic. 
Heart is neurogenic in arthropods.

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

The heart of a healthy man beats normally .................. per minute

  1. 50 - 60 times

  2. 70 - 80 times

  3. 90 - 100 times

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sinoatrial node (SAN) can generate the maximum number of action potentials, i.e., 70 - 75 beats/min, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called as the pacemaker of the heart.