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The condition of erythroblastosis foetalis is–

Rh^– female and Rh⁺ male with first Rh⁺ baby

Rh⁺ female and Rh⁺ malewith first Rh^– baby

Rh⁺ female and Rh^–malewith first Rh^– baby

Rh^– female and Rh^– malewith first Rh⁺ baby

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Explanation

NCERT, P -281, Rh Grouping

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Lymph has following properties

(i) Same mineral distribution as that of plasma

(ii) Intestine also has lymph

(iii) Also known as tissue fluid because it helps in exchange

(iv) Lymph plays role in defence as well

How many statements are correct?

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Explanation

NCERT, P -282, Lymph

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In open circulatory system, blood is pumped through

Sinuses to large vessels

Large vessels to sinuses

Cavities to organs

Spaces to large vessels

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Explanation

NCERT, P -282, Circulatory Pathways, Para1

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Inter atrial septa are:

thin muscular

thick muscular

thin fibrous

thick fibrous

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Explanation

NCERT, P -283, Circulatory Pathways, Para 2.

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Which one is incorrect in the following:

Inter atrial septa – thin and muscular

Atrio– ventricular septa – thick and fibrous

Inter ventricular septa – thick and muscular

Pericardium – muscular

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Explanation

NCERT, P -283, Circulatory Pathways, Para 2.

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Bundle of His includes:

Purkinje fibres + left AV bundle

Purkinje fibres + right AV bundle

Purkinje fibres + right and left AV bundle

SA node + AV node + AV bundle

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Explanation

NCERT, P -284, Para 2

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Which one of the following is wrong with respect to nodal tissue.

auto excitable

not localized to a single chamber.

equal ability to excite throughout nodal tissue.

structural changes are observed throughout nodal musculature in different chambers of the heart.

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Explanation

NCERT, P -284, Para 2

The entire heart is made up of cardiac muscles. A specialized cardiac musculature called the nodal tissue is also distributed in the heart. A patch of this tissue called SA node and another mass of this tissue called AV node is also present. Although all the heart muscle cell have the ability to generates the electrical impulses or action potentials but SA node generates maximum number of action potentials (70-75/min).

so there is no equal ability to excite throughout nodal tissue.

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The duration of cardiac cycle is–

0.8 second

0.5 second

0.3 second

0.4 second

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Explanation

NCERT, P -285, Para 2

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The number of action potential generated by SAN:

70–75 times per minute.

50–72 times per minute.

Exact 70 times per minute.

not more than 60 times per minute.

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Explanation

NCERT, P -284, Para 2

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The route of action potential in heart is

SA node – AV node – AV bundle

AV node – SA node – bundle of his – AV bundle

SA node – AV node – AV bundle – Bundle of His

SA node – AV node – Purkinje fibres

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Explanation

NCERT, P -284, Para 2

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