Short note on the structure of heart of mammals, amphibians, reptiles and fishes
Answers
MAMMALS :
The External structure
The mammalian heart is shaped as a hollow and is surrounded by a protective sac known as the pericardium. The membrane is a double membrane where the space between the two membranes is filled with watery fluid that allows the heart beat to rhythm smoothly and prevent friction.
AMPHIBIANS :
Amphibians have a three-chambered heart which consists of two atria and one ventricle. Blood leaving the ventricle passes into one of two vessels.Both atria empty into the single ventricle, mixing the oxygen-rich blood returning from the lungs with the oxygen-depleted blood from the body tissues.
REPTILES :
Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle. The left subchamber is called the left ventricle, or cavum venosum; it receives blood from the right atrium and leads to the body.
FISHES :
The heart of fishes is known as branchial heart, because its main function is to pump venous blood to ventral aorta into gills (branchial) and then to somatic vasculature. ... The heart of fishes consists of four chambers, a sinus venosus, an atrium, a ventricle and a conus or a bulbus arteriosus.
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MAMMALS :
The External structure
The mammalian heart is shaped as a hollow and is surrounded by a protective sac known as the pericardium. The membrane is a double membrane where the space between the two membranes is filled with watery fluid that allows the heart beat to rhythm smoothly and prevent friction.
AMPHIBIANS :
Amphibians have a three-chambered heart which consists of two atria and one ventricle. Blood leaving the ventricle passes into one of two vessels.Both atria empty into the single ventricle, mixing the oxygen-rich blood returning from the lungs with the oxygen-depleted blood from the body tissues.
REPTILES :
Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle. The left subchamber is called the left ventricle, or cavum venosum; it receives blood from the right atrium and leads to the body.
FISHES :
The heart of fishes is known as branchial heart, because its main function is to pump venous blood to ventral aorta into gills (branchial) and then to somatic vasculature. ... The heart of fishes consists of four chambers, a sinus venosus, an atrium, a ventricle and a conus or a bulbus arteriosus.