Tag: cardiac cycle
Questions Related to cardiac cycle
Where is the pacemaker situated?
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In left auricle near opening of pulmonary vein
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In right auricle near eustachian valve
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On inter-auricular septum
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On inter-ventricular septum
Sino-atrial node is the natural pacemaker of the heart. These are a group of small, flattened and ellipsoid strip cardiac muscle fiber situated in the upper lateral wall of the right atrium near the Eustachian valve (valve of the inferior vena cava).
Pacemaker influences
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Contraction of heart muscles
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Flow of blood in heart
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Rate of heart beat
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Formation of nerve impulse
A specialised cardiac musculature, called as the nodal tissue is distributed in the heart. A patch of this tissue is present in the right upper corner of the right atrium, called as the sino-atrial node (SAN).
The heartbeat is regulated by a small node of cardiac muscles called
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Pericardium
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Ventricle
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Tricuspid valve
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Pacemaker
A small node of specialized tissue is located int he upper right corner of right ventricle called as SA node. It is known as natural pacemaker of heart as it is responsible for initiation and regulation of heart beat.
In the heart of frog, which of the following is considered as the pacemaker?
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Pylangium
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Synangium
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Truncus
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Sinus venosus
In amphibians, such as the frog, the pacemaker is the sinus venosus, an enlarged region between the vena cava and the right atrium. The venae cavae do not open directly into the auricles but into another chamber, the sinus venosus, which drains into the right auricle.
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