Tag: transport in animals

Questions Related to transport in animals

Bundle of His is

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

  1. Nervous tissue supplying ventricles

  2. Nervous tissue supplying heart

  3. Muscular tissue supplying atria

  4. Muscular tissue supplying ventricles

Show answer
Correct Option: D
Explanation:

A) Bundle of His is a muscular tissue.

B) Bundle of His is a muscular tissue that carries electrical impulses to the ventricles.
C) Bundle of His supplies to the ventricles.
D) The bundle of His is an important part of the electrical conduction system of the heart, as it transmits impulses from the atrioventricular node, located at the inferior end of the interatrial septum, to the ventricles of the heart. It is a muscular tissue.
So the correct answer is 'Muscular tissue supplying ventricles'.

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.

Show answer
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

Show answer
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.'

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

Show answer
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

Show answer
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

Show answer
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

SA node is found in

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

  1. Lungs

  2. Brain

  3. Spleen

  4. Heart

Show answer
Correct Option: D
Explanation:
  • The SA node is the heart's natural pacemaker. 
  • The SA node is a muscular tissue where electrical impulses are generated for the rhythmic contractions of the heart.

    Hence, option D is correct.

Heart beat in vertebrates is

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

  1. Neurogenic

  2. Myogenic

  3. Both of the above

  4. None of the above

Show answer
Correct Option: B
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.

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

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

  1. 50 - 60 times

  2. 70 - 80 times

  3. 90 - 100 times

  4. None of the above

Show answer
Correct Option: B
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.