Birds and mammals have a:

Three-chambered heart

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Four-chambered heart

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Pseudo four-chambered heart

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Two-chambered heart

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Solution

The correct option is B Four-chambered heart
In Birds, the heart is four-chambered (two atria and two ventricles) with no sinus venous; only the right systemic arch is present. This keeps the oxygenated and deoxygenated blood separate.
In Mammals, the heart is myogenic and four-chambered with two atria and two ventricles so that pure blood circulates through the left half and impure blood through the right half of the body.
So, the correct answer is option B.

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Similar questions

Q. The heart of mammals and birds is four-chambered, while fishes have two-chambered hearts and amphibians and reptiles have three-chambered hearts. The hearts of birds and mammals are:

Q. Assertion: Mammals and birds are warm blooded organisms which maintain a uniform internal body temperature.
Reason: Mammals and birds have a four-chambered heart.

Q. Match the following:

\begin{matrix} (i) A m p h i b i a n s a n d m o s t r e p t i l e s & A . 2 - c h a m b e r e d h e a r t (i i) B i r d s a n d m a m m a l s & B . 3 - c h a m b e r e d h e a r t (i i i) F i s h & C .4 - c h a m b e r e d h e a r t \end{matrix}

Q. Match the following:

\begin{matrix} (i) A m p h i b i a n s a n d m o s t r e p t i l e s & A . 2 - c h a m b e r e d h e a r t (i i) B i r d s a n d m a m m a l s & B . 3 - c h a m b e r e d h e a r t (i i i) F i s h & C . 4 - c h a m b e r e d h e a r t \end{matrix}

Match the following:
$\begin{matrix} (i) Amphibians and most reptiles & A. 2-chambered heart (ii) Birds and mammals & B. 3-chambered heart (iii) Fish & C.4-chambered heart \end{matrix}$

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