Tag: biology

Questions Related to biology

Volume of blood that enters aorta with each ventricular systole is

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

  1. Vital capacity

  2. Cardiac style

  3. Stroke volume

  4. Cardiac output.

Show answer
Correct Option: C

Left auricle receives pure blood from

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

  1. Pulmonary veins

  2. Pulmonary artery

  3. Superior vena cava

  4. Inferior vena cava.

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Correct Option: A

The pulmonary artery carries 

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

  1. Deoxygenated blood to the lungs

  2. Oxygenated blood to brain

  3. Oxygenated blood to the lungs

  4. Deoxygenated blood to the kidney

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Correct Option: A
Explanation:
  • Blood enters the heart through two large veins, the inferior and superior vena cava brought from different parts of the body.
  • This oxygen-deficient blood from the body is emptied into the right atrium of the heart which is further pumped to the right ventricle. 
  • As the right ventricle contracts, blood is pumped into the pulmonary artery and to the lungs where it is oxygenated.
  • Thus, the pulmonary arteries carry deoxygenated blood from the right ventricles to the lungs. So, the correct answer is 'Deoxygenated blood to the lungs'.

Fill in the blanks with suitable words given below:
The_______ artery takes the blood from the ventricles to the lungs.

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

  1. Serum

  2. Fibrinogen

  3. Hemoglobin

  4. Pulmonary

  5. Sphygmomanometer

  6. Ventricles

Show answer
Correct Option: D
Explanation:

The pulmonary artery is the artery that carries blood from the right ventricle of the heart to the lungs for oxygenation. It is involved in the pulmonary circulation of the cardiovascular system.

Hence, the correct answer is 'Pulmonary'.

In human foetus, the heart begins to beat at developmental age of

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

  1. $4$ week

  2. $3$ week

  3. $6$ week

  4. $8$ week

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Correct Option: A
Explanation:

During $3$ to $4$ weeks of gestation, the heart usually starts beating in human foetus.

So, option A is the correct answer.

Choose the correct answer from the alternatives given.
Blood travels from heart to lungs byway of the:

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

  1. Pulmonary artery

  2. Pulmonary vein

  3. Anterior vena cava

  4. Posterior vena cava

Show answer
Correct Option: A
Explanation:

  • Pulmonary artery and the Pulmonary vein are a set of blood vessels that are related to the lungs. 
  • The Pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation, this oxygenated blood is carried back to the heart by the Pulmonary vein for systemic circulation i.e. for ​circulation to different parts of the body.
So, the correct option is 'Pulmonary artery'.

Pulmonary artery originates from the:

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

  1. right ventricle

  2. left ventricle

  3. right auricle

  4. left auricle

Show answer
Correct Option: A
Explanation:

Pulmonary artery and the Pulmonary vein are a set of blood vessels that are related to the lungs. The Pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation, this oxygenated blood is carried back to the heart by the Pulmonary vein for systemic circulation i.e. for ​circulation to different parts of the body.

So, the correct option is 'Right Ventricle'.

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:

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

  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

Show answer
Correct Option: C
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'.

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? 

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

  1. One

  2. Two

  3. Four

  4. Three

Show answer
Correct Option: A
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'.

The cardiac impulse is initiated and conducted further upto ventricle. 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, Purkinjee fibre

  4. SA Node, Punkinje fibre, AV Bundle, AV Node

Show answer
Correct Option: C
Explanation:
The nerve impulses produced by the SA node travel to the AV node and cause the initiation of the articular depolarization. From here, the impulse travels to the AV bundle and then to the Purkinje fibres.
Thus, the correct answer is 'SA Node, AV node, AV Bundle, Purkinje fibre.'