Balbharati solutions for Biology [English] 12 Standard HSC Maharashtra State Board chapter 8 - Respiration and Circulation [Latest edition]

Choose the correct alternative.

The muscular structure that separates the thoracic and abdominal cavity is _______.

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What is the minimum number of the plasma membrane that oxygen has to diffuse across to pass from air in the alveolus to haemoglobin inside a RBC?

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________ is a sound-producing organ.

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The maximum volume of gas that is inhaled during breathing in addition to T.V is _______.

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_______ muscles contract when the external intercostal muscles contract.

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Movement of cytoplasm in unicellular organisms is called __________.

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Which of the following animals do not have closed circulation?

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Diapedesis is performed by ______.

______ is known as pacemaker of heart.

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Which of the following is without a nucleus?

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Cockroach shows which kind of circulatory system?

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Diapedesis can be seen in _________ cell.

Opening of inferior vena cava is guarded by _______.

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_______ wave in ECG represent atrial depolarization.

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The fluid seen in the intercellular spaces in human is _________

Match the Respiratory surface to the organism in which it is found.

Very short answer question.

Why does trachea have ‘C’ shaped rings of cartilage?

Very short answer question.

Why is respiration in insect called direct respiration?

Very short answer question.

Why is a gas exchange very rapid at the alveolar level?

Very short answer question.

Name the organ which prevents the following the entry of food into the trachea while eating.

Short answer question.

Why is it advantageous to breathe through the nose than through the mouth?

Short answer question.

Identify the incorrect statement and correct it,

a. A respiratory surface area should have a large surface area.

b. A respiratory surface area should be kept dry.

c. A respiratory surface area should be thin, maybe 1mm or less.

Given below is the characteristic of some modified respiratory movements. Identify them.

Spasmodic contraction of muscles of expiration and forceful expulsion of air through nose and mouth.

Given below is the characteristic of some modified respiratory movement. Identify them.

An inspiration followed by many short convulsive expirations accompanied by facial expression.

Short answer question.

Write a note on blood plasma.

Explain the process of blood clotting.

Describe pericardium.

Short answer question.

Describe valves of human heart.

Short answer question.

What is the role of papillary muscles and chordae tendinae in the human heart?

Short answer question.

Explain in brief the factors affecting blood pressure..

Give a scientific reason.

Closed circulation is more efficient than open circulation.

Give scientific reason.

Human heart is called as myogenic and autorhythmic.

Give scientific reason.

Person who has undergone a heart transplant needs lifetime supply of immunosuppressants.

Give scientific reason.

Arteries are thicker than veins.

Give scientific reason.

Left ventricle is thick than all other chambers of heart.

Distinguish between open circulation and closed circulation.

Give any three differences between an artery and a vein

Distinguish between Blood and lymph.

Distinguish between Blood capillary and lymph capillary

Distinguish between Intrinsic and extrinsic process of clotting

Long answer question:

Smita was working in a garage with the doors closed and automobile's engine running. After some time she felt breathless and fainted. What would be the reason? How can she be treated?

Long answer question:

Shreyas went to a garden on a wintry morning. When he came back, he found it difficult to breathe and started wheezing. What could be the possible condition and how can he be treated?

Why can you feel a pulse when you keep a finger on the wrist or neck but not when you keep them on a vein?

Long answer question:

A man’s pulse rate is 68 and cardiac output is 5500 cm3 . Find the stroke volume.

Long answer question:

Which blood vessel of the heart will have the maximum content of oxygen and why?

Long answer question:

If the duration of the atrial systole is 0.1 sec and that of complete diastole is 0.4 sec, then how does one cardiac cycle complete in 0.8 sec?

Long answer question:

How blood is kept moving in the large veins of the legs?

Long answer question:

Describe the histological structure of the artery, vein, and capillary.

What is blood pressure? 

How is blood pressure measured?

Explain the factors affecting blood pressure.

Long answer question:

Describe human blood and give its functions.