Question

Assertion: Mammals and Birds have a four chambered heart
Reason: Mammals and Birds are warm blooded


a) Both A and R are true and R is the correct explanation of the assertion
b) Both A and R are true but R is not the correct explanation of the assertion
c) A is true but R is false
d) A is false​

Answer 1

a) Both A and R are true and R is the correct explanation of the assertion.

Explanation:

• Mammals and birds are warm-blooded organisms with four-chambered hearts as they have high energy needs to maintain their body temperature.
• They must have a four-chambered heart to separate oxygenated and de-oxygenated blood, so their circulatory system is more efficient and maintains their constant temperature.
• The four-chambered heart has a distinct advantage over simpler structures: It allows us to send our "dirty" blood to the cleaners-the lungs-and our "clean" blood to the rest of the body without mixing the two.

Answer 2

Both A and R are true and R is the correct explanation of the assertion

Explanation:

• Mammals and Birds have a four chambered heart.
• Mammals and birds have four chambered hearts because they require a lot of energy to keep their body temperature constant.
• The separation of the chambers keeps oxygenated and deoxygenated blood from mingling, allowing for a more effective delivery of oxygen to the body.
• The four-chambered heart has a strong benefit over simpler designs in that it allows humans to carry "dirty" blood to the lungs for cleaning and "clean" blood to the rest of the body without mixing the two.
• That system is quite effective.
• Mammals and Birds are warm blooded
• Because they can create this internal temperature, all birds and mammals are homoiotherms, or hot species.
• The body temperature of mammals ranges from 97°F to 104°F.
• Warm-bloodedness is thought to have developed in mammals and birds as a means of defence against fungal diseases.
• Only a small percentage of fungal can withstand the core temperature of warm-blooded mammals. Insects, reptiles, and amphibians, on the other hand, are tormented by fungal diseases.