Tag: the circulatory system
Questions Related to the circulatory system
In which of the following pairs, the two items mean one and the same thing?
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Malleus - Anvil
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SA node - Pacemaker
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Leucocytes - Lymphocytes
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Haemophilia - Lung cancer
Malleus is hammer like bone of the middle ear.
An artificial pacemaker is implanted subcutaneously and connected to the heart in patients
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Having 90% blockage of the three main coronary arteries
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Having a very high blood pressure
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With irregularity in the heart rhythm
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Suffering from arteriosclerosis
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of
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Sinoatrial node
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Atrioventricular node
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Atrioventricular bundle
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Purkinje system
Sinoatrial node is known as pacemaker of the heart. It helps in the generation and conduction of heart beat. It is located in the walls of the right atria just below the opening of superior venacva. The sympathetic nerves release the neurotransmitters and activates the SA node and generates electric impulse which is conducted as heart beat through out the heart.
Function of SA node is to ensure
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Muscular pain
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Contraction of lungs
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Heart beat
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None of the above
The entire heart is made of cardiac muscles. A specialized cardiac musculature called the nodal tissue is also distributed in the heart i.e sino-atrial node (SAN- A patch of this tissue is present in the right upper corner of the right atrium ). The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable. Hence function of the SA node is to ensure heartbeat.
Mark the correct match.
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Malleus - Anvil
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SA node - Pacemaker
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Leucocytes - Lymphocytes
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Haemophilia - Blood cancer
Pacemaker is situated in heart
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In the wall of right atrium
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On interauricular septum
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On interventricular septum
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In the wall of left atrium
State whether the following statements are true or false.
A pacemaker is a tiny computerised electrical device that is implanted in -a patients body to regulate the brain activity.
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True
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False
A pacemaker is a tiny battery run instrument placed near to the heart of a patient for generation impulses similar to the SA node for the rhythmic functioning of the heart
Which of the following is the correct pathway for propagation of cardiac impulse?
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SA node $\rightarrow$ AV node $\rightarrow$ Bundle of His $\rightarrow$ Purkinje fibres
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AV node $\rightarrow$ Bundle of His $\rightarrow$ SA node $\rightarrow$ Purkinje fibres
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SA node $\rightarrow$ Purkinje fibres $\rightarrow$ AV node $\rightarrow$ Bundle of His
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Purkinje fibres $\rightarrow$ AV node $\rightarrow$ SA node $\rightarrow$ Bundle of His.
Cardiac impulse generates from SA node then it reaches to AV node, then to bundle of HIS and finally to Purkinje fibers, this is how the cardiac impulse is generated.
What happens when the pacemaker becomes nonfunctional?
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Only auricles contract rhythmically
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Only ventricles contract rhythmically
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Cardiac muscles do not undergo co-ordinated rhythmic movements
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Auricles and ventricles contract rhythmically
An artificial pacemaker is implanted subcutaneously and connected to the heart in patients
-
Having 90% blockage of the three main coronary arteries
-
Having a very high blood pressure
-
With irregularity in the heart rhythm
-
Suffering from arteriosclerosis
Pacemaker serves to produce rhythmic impulses for the heart beat. The sinoatrial node (SA) node serves as a pacemaker and is a small mass of specialized cardiac muscle. It is present in the posterior wall of the right atrium near the opening of superior vena cava.