Answer in Only One Sentence of the Following Question: Mention the Role of Pacemaker in Human Heart. - Biology

Answer in only one sentence of the following question:

Mention the role of the pacemaker in human heart.

One Line Answer

The Sinu-auricular (SA) node is the pacemaker of the heart.
It generates wave of contraction which spread along the wall of atria and bring about their contraction.
It has highest degree of rhythmicity and is the first to originate the cardiac impulses and determine the rate of heart beat.

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2013-2014 (October) Set 1

Q 6.A.iii | 1 mark

Select the odd one in the following:
Tricuspid, Bicuspid, Semilunar, Foramen ovales.

Label the following diagram :

Choose the correct answer:
In mammals the opening of post caval in the right auricle is guarded by _________

Complete the following sentence with appropriate word:
The average heartbeat rate is ____ beats per minute in human being.

Identify the INCORRECT statement regarding heart.

In ____________ of a mammalian heart O₂ rich blood enter first.

Analogy:

Heart: Pericardium membrane.
Lungs: ______.

The QRS complex in a standard ECG represents ______.

Give the meaning of pacemaker.

Note the relationship between the first two words and suggest a suitable word/words for the fourth place:

Lub : Atrioventricular valves :: Dup : ______