Question

Largest heart is of
A. Giraffe
B. Elephant
C. Crocodile
D. Lion

Answer 1

Hint: The function of the heart is to pump blood so that the blood reaches the entire body. As the body size and the distance to the organs increases, it requires more power to pump the blood. Blue whale has the largest heart among all animals.

Complete answer:
Option A: Giraffe is the tallest animal with around five meter high. And their neck alone is 6.5 foot in length, therefore pumping blood from lower body to brain requires a lot of energy. Therefore they have a large and strong heart which weighs up to 11 kg and spans 2 feet, making it the biggest of any land animal. This is the correct answer.

A remarkable network of veins and one way valves are present in the giraffe's circulation system to prevent back flow and random flow of blood. The heart can beat up to 170 beats per minute.
Option B: Elephants are the biggest animal in the land. Elephants weigh around 6000 kg, and the weight of their heart is 21-25 kg. Their heart is heavier than that of a giraffe , but the length is less than that of a giraffe. Elephants have the second biggest heart in land animals. Therefore, this is the incorrect option.
Option C: Crocodile heart is unique even though they share anatomical features with reptiles and mammals. They are four chambered, and small in size.Therefore, this is the incorrect option.
Option D: Lions are comparatively small animals with 130-190 kg body weight. Their heart weighs 1100 to 1200 grams.Therefore, this is the incorrect option.

Crocodiles have two aorta, the main artery that supplies the blood to the circulatory system. A specialised circulation in crocodiles results in mixing of oxygen rich blood coming from lungs with the oxygen poor blood coming back from the body. This will result in a decrease of oxygen levels in the blood that to be circulated through the body.

Hence, the correct answer is option (A)

Note: 1.The size of the heart of the animals will be comparative to their body size.
2.The characteristics of the heart will be associated with their body functioning.