Tag: heart, blood vessels and cardiac cycle

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Questions Related to heart, blood vessels and cardiac cycle

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

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

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice biology transport in animals cardiac cycle heart, blood vessels and cardiac cycle human heart

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

  1. a,b

  2. a, b, c

  3. b, c, d

  4. all
Reveal answer Fill a bubble to check yourself
A Correct answer
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.'

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