BiologyClass 10ICSE
Q
(a) Name the red pigment which carries oxygen in the blood. (a) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds? (b) How many chambers are there in the heart of (i) an amphibian, (ii) a mammal, and (iii) a fish? (c) Describe the circulatory system in a fish.
A
- Hemoglobin is the red color pigment that carries oxygen in the
- It is necessary to separate the oxygenated and the deoxygenated blood in mammals and birds as this separation allows a highly efficient supply of oxygen to the blood Humans are warm-blooded animals hence the separation of oxygenated and deoxygenated helps in regulating the body temperature.
- (i) An amphibian: Has a three-chambered heart, with two auricles and one
- A mammal has a four-chambered The upper two chambers are called atria and the lower two chambers are called ventricles.
- A fish has only two chambers in its heart, e. one auricle and one ventricle.
- A fish has a two-chambered heart with one auricle and one ventricle. Since both the auricle and ventricle remain undivided, only deoxygenated blood passes through it. The deoxygenated blood passes from the ventricles into the gills for oxygenation. The oxygenated blood from the gills is then passed to the body parts of the fish where oxygen is utilized and carbon dioxide enters it, thereby making the blood The deoxygenated blood then returns to the heart to be pumped again into the gills for oxygenation.