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

The atrio-ventricular node is situated

  1. Near the bicuspid valve

  2. In between the atrium

  3. At the base of inter-auricular septum

  4. In the interventricular septum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The heart beat originates at SA node and passes to the AV node which finally conducts it to the bundle of His. The AV node is placed between the atria and the ventricles of the heart, specifically in the posteroinferior region of the interatrial septum near the opening of the coronary sinus, which conducts the normal electrical impulse from the atria to the ventricles.

So, the correct answer is option C.

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

In which the following has the ability to generate action potentials without any external stimuli? 

  1. Sino-atrial node(SAN)

  2. Atrio-ventricular node (AVN)

  3. Purkinje fibers

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sino-atrial node(SAN)  is known as a pacemaker and has the ability to generate action potentials without any external stimuli. 

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

When the right ventricle of heart of man contracts then blood is pumped into

  1. Superior vena cava

  2. Dorsal aorta

  3. Pulmonary artery

  4. Pulmonary vein
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pulmonary artery is the vessel transporting de-oxygenated blood from the right ventricle to the lungs. Deoxygenated blood from the systemic circulation enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. From here it is pumped into the pulmonary circulation through the pulmonary artery, to the lungs where it receives oxygen and gives off carbon dioxide. 

So, the correct answer is option C.

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

Choose correct alternative in the following statements:
The only artery which carries deoxygenated blood is called

  1. Hepatic artery

  2. Pulmonary artery

  3. Aorta

  4. Renal artery
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The only artery which carries deoxygenated blood is called the pulmonary artery. It carries deoxygenated blood from the right ventricle into the lungs for oxygenation. 
  • Hepatic artery is a short blood vessel that supplies oxygenated blood to the liver.
  • Aorta is the largest artery in the body. It carries oxygenated blood from left ventricle to the other parts of the body.
  • Renal artery carries oxygenated blood to kidneys.
Hence, the correct answer is 'Pulmonary artery'.

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

What happens when the pacemaker becomes non-functional?

  1. Only auricles contract rhythmically

  2. Only ventricles contract rhythmically

  3. Cardiac muscles do not undergo coordinated rhythmic movements

  4. Cardiac muscles contract in coordinated manner rhythmically

  5. Auricles and ventricles contract rhythmically.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The natural (SA node) or artificial pacemaker has a function to send electrical impulses from atrium for contraction and pumping action into the ventricles. The impulses get transferred in the following route :

SA node(pacemaker) $\rightarrow$ Interatrial cardiac fibre $\rightarrow$ AV node(pacesetter) $\rightarrow$ Bundle of his $\rightarrow$ Bundle branch $\rightarrow$Purkinje fibres.
Thus, the rhythmic contraction of the heart is made by SA node.
So, if the pacemaker becomes non-functional then, cardiac muscles do not undergo coordinated rhythmic movement.

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

Choose the correct answer from the alternatives given.
Which of the following blood vessels carries oxygen poor blood from the heart to lungs?

  1. Pulmonary vein

  2. Pulmonary artery

  3. Carotid artery

  4. Aorta
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart. The pulmonary artery is responsible for transporting oxygen-depleted blood away from the heart and back toward the lungs. Carotid artery is present in the neck region and supply blood to the brain, neck, and face. The aorta is the artery that carries blood away from the heart to the rest of the body. So, the correct option is 'Pulmonary artery'.

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

Choose the correct answer from the alternatives given.
Which of the following parts of the heart pumps blood to lungs?

  1. Left atrium

  2. Right atrium

  3. Left ventricle

  4. Right ventricle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Right atrium is just below the right atrium and receives deoxygenated blood from the right atrium and then pumps this deoxygenated blood to the lungs through the pulmonary artery.

So, the correct option is 'Right atrium'.

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

Blood is not a tissue because it is a fluid

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood is considered a connective tissue due to two basic reasons: (1) Embryologically, it has the same origin (mesodermal) as other connective tissues (2) Blood connects the body systems together and transports the required oxygen, nutrients, hormones and other signaling molecules, and removes the wastes. 
So, the correct answer is option B.

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

The duration of cardiac cycle is

  1. 0.8 sec
  2. 0.8 $\mu $ sec

  3. 0.08 sec

  4. 0.008 sec
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The cardiac cycle consists of a period of relaxation called diastole, during which the heart fills with blood, followed by a period of contraction called systole. The total duration of the cardiac cycle, including systole and diastole, is the reciprocal of the heart rate. For example, if heart rate is 72 beats/min, the duration of the cardiac cycle is 1/72 beats/min about 0.0139 minutes per beat, or 0.833 second per beat.