Tag: transport in animals

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Questions Related to transport in animals

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

Bundle of His is

  1. Nervous tissue supplying ventricles

  2. Nervous tissue supplying heart

  3. Muscular tissue supplying atria

  4. Muscular tissue supplying ventricles
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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 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.