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Rrog's heart when taken out of the body ...

Rrog's heart when taken out of the body continues to beat for sometime.
Select the best option from the following statements.
(a) Frog is poikilotherm
(b) Frog does not have any coronary circulation
(c ) Heart is "myogenic" in nature
(d) Heart is autoexcitable

A

Only d

B

a and b

C

c and d

D

Only c

Text Solution

Verified by Experts

The correct Answer is:
C
Frog's heat when taken out of the body continues to beat for sometime because Frog's heart is "myogenic" in nature and is autoexcitable.
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Frog's heart when taken out of the body continues to beat for sometime Select the best option from the following statements (A) Frog is a poikilotherm (B) Frog does not have any coronary circulation (C) Heart is "Myogenic" in nature (D) Heart is autoexcitable

Frog's heart when taken out of the body continues to beat for sometime . Select the best option from the following statements . I . Frog is a poikilothem . II . Frog does not have any coronary circulation. III . Heart is autoexcitable .

Consider the following statements? (a) Before birth, foramen ovale allows the blood to pass from right atrium to left atrium , thus bypassing the pulmonary circulation , (b) Heart is protected by a double walled pericardium , (c) The muscle fibres present in heart are different from smooth muscles in being mesodermal in origin , (d) Nodal tissues like AVN, SAN are specialised neural tissues which are distributed in heart. How many among the statements mentioned above are correct?

Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both the assertion and the reason are true and the reason is a correct explanation of the assertion (b) If both the assertion and reason are true but the reason is not a correct explanation of the assertion (c) If the assertion is true but the reason is false (d) If both the assertion and reason are false (e) If the assertion is false but reason is true Assertion : An artifical pacemaker can replace the sinoatrial node of heart. Reason : This is because, an artifical pacemaker is capable of stimulating the heart electrically to maintain its beats.

Explain the following : (a) Why does the atrial systole normally precedes the ventricular systole ? (b) Why is S-A node called the pacemaker of the heart ? (c ) Why does the ventricle relax as a closed chamber in the early phase of its diastole ? (d) Why is there no mixing of deoxygenated and oxgenated blood in mammalian heart ? (e ) Why can you palpate the pulse on an artery in each heart beat ? (f) Why does the lymph contain much less proteins than the plasma ? (g) Why does the ventricle contract as a closed chamber in the early phase of its systole ? (h) Why is the closed circulatory system more efficient than the open one ? (i) Why does the left ventricle has a thicker wall than the right ventricle ?

Read the following four statements carefully: I. About 70 ml of blood is pumped out by each Ventricle during a cardiac cycle is called the beat volume. II. The fluid called lymph is almost similar to blood plasma without any exception III. Heart failure simply means when the heart stops beating . IV. Hypotension leads to heart diseases as well as damage to the brain , kidney and other vital organs. How many from the above is/are correct ?

Read the following statements carefully (i) In fishes, the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body part from where deoxygenated blood is returned to the heart (ii) The openings of the right and the left ventricles into pulmonary artery and aorta respectively are provided with the mitral valves (iii) The nodal musculature has the ability to generate action potential without any external stimuli, i,e., it is autoexcitable (iv) The T-wave of ECG represent depolarisation of the ventricles. Which of the above two statements are incorrect ?

Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta. Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated. Which chambers of human heart contain oxygenated blood?

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