Biology

Cardiovascular and Nervous System

983 Questions

Review the human cardiovascular system through these competitive exam practice questions. Key areas include heart valves, cardiac impulse pathways, and blood pressure regulation. A solid grasp of these fundamentals is crucial for science sections.

Heart anatomy and valvesCardiac impulse conductionBlood pressure mechanicsHeartbeat regulation

Cardiovascular and Nervous System Questions

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

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.

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

Which of the following set is correct?

  1. Sebum - Analgesic

  2. Vitamin - Nicotine

  3. Corpus callosum - Graffian follicle

  4. Bundle of His - Purkinje fibre
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The bundle of His is the upper end of the electrical path,which through the Purkinje fibres allows the electrical signal to activate the ventricles and thus to pump the blood.

So, the correct answer is 'Bundle of His - Purkinje fibre'.

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

Choose the correct answer from the alternatives given.
The typical lub-dub sounds heard in the heart beat of a healthy person are due to:

  1. closing of the semilunar valves

  2. closing of the tricuspid and bicuspid valves

  3. closing of the tricuspid and bicuspid valves followed by the closing of the semilunar valves

  4. blood flow through the aorta
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Heart sounds are noises generated by the closing and opening of the heart valves. In a healthy individual, there are two normal heart sounds called lub and dub. Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole. The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.

So, the correct option is 'closing of the tricuspid and bicuspid valves followed by the closing of the semilunar valves'.

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

Go through the statements
Statement (I): The AV node and the bundle of His constitute the only electrical link between the atria and the ventricles.
Statement (II): The Bundle of His is a bundle of electrical nodes which allow the ventricles to contract.
Statement (III): The bundle of His is a group of fibres that carry electrical impulses through the centre of the heart
Statement (IV) : The bundle of His is located in the proximal intraventricular septum
How many of the above statements are correct? 

  1. One

  2. Two

  3. Four

  4. Three
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The AV node is located at the inferior end of the inter-atrial septum and the Bundle of His help in transmission of electrical impulses from the AV node to the ventricles. So, they constitute the electrical link between the atria and the ventricles.
  • The Purkinje fibres carry the electrical impulses from the left and the right bundle of his (in the ventricles) to the contractile cells of the myocardium and cause contraction of the ventricles.
  • The bundle of his is a bundle of cardiac muscle fibres that carry the electrical impulses from the AV node located at the inferior end of the inter-atrial septum (near the bottom of the right atrium) into the right and the left ventricles. They, therefore, do not carry impulses through the centre and are not located only at the proximal end of the interventricular septum.
So, the correct option is 'One'.