Answer
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Hint: In two chambered hearts the blood is not free in a cavity that forms a closed- loop system. Thus, they have gills to breathe and to purify their blood. They are ectothermic and live in water.
Complete answer:
Fishes have a closed-loop circulatory system, where the heart pumps the blood in a single loop throughout the body. Crocodiles have a four-chambered heart. Aves and amphibians have a three-chambered heart that shows more complex circulation than fishes.
Additional Information:
-Fishes are vertebrates are gills bearing animals that lack limbs and digits.
-Fishes have four parts of the heart including two chambers.
-The blood enters through the sinus venosus to the atrium and sends it to the ventricle where it pumps out of the heart.
-The presence of bulbus arteriosus which connects the aorta and is responsible for the pressure of blood in the heart.
-The ventricle pumps deoxygenated blood to the gills and oxygen from the surrounding water is replenished to the blood.
-Mammals and birds have a high oxygen demand and have high metabolism thus have a four-chambered heart so it can flow more rapidly to the other tissues.
-Two and three chambered hearts are less efficient than four chambered hearts due to mixing of blood.
So, the correct option is ‘fishes’.
Note:
-Animals having two-chambered hearts use gills to replenish oxygen in the blood.
-Animals having three or four hearts are those that also contain lungs for respiration.
-Amphibians have a three-chambered heart that is two atria and one ventricle.
-In the chambered heart the right atrium receives oxygen-poor blood from the body and the left ventricle pumps out the oxygen-rich blood to the body.
Complete answer:
Fishes have a closed-loop circulatory system, where the heart pumps the blood in a single loop throughout the body. Crocodiles have a four-chambered heart. Aves and amphibians have a three-chambered heart that shows more complex circulation than fishes.
Additional Information:
-Fishes are vertebrates are gills bearing animals that lack limbs and digits.
-Fishes have four parts of the heart including two chambers.
-The blood enters through the sinus venosus to the atrium and sends it to the ventricle where it pumps out of the heart.
-The presence of bulbus arteriosus which connects the aorta and is responsible for the pressure of blood in the heart.
-The ventricle pumps deoxygenated blood to the gills and oxygen from the surrounding water is replenished to the blood.
-Mammals and birds have a high oxygen demand and have high metabolism thus have a four-chambered heart so it can flow more rapidly to the other tissues.
-Two and three chambered hearts are less efficient than four chambered hearts due to mixing of blood.
So, the correct option is ‘fishes’.
Note:
-Animals having two-chambered hearts use gills to replenish oxygen in the blood.
-Animals having three or four hearts are those that also contain lungs for respiration.
-Amphibians have a three-chambered heart that is two atria and one ventricle.
-In the chambered heart the right atrium receives oxygen-poor blood from the body and the left ventricle pumps out the oxygen-rich blood to the body.
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