Question

which of the following is placed in the correct order for the systemic circuit?
a left atrium→left ventricle→aorta→arteries→capillaries→veins
b right atrium→right ventricle→aorta→arteries→capillaries→veins
c left atrium→left ventricle→veins→capillaries→arteries→aorta
d right atrium→right ventricle→ veins→capillaries→arteries→aorta
e left atrium→left ventricle→aorta→arteries→veins→capillaries
question 26
double circulation, using a four - chambered heart, ensures that oxygenated blood reaches tissues quickly in
a amphibians and reptiles
b birds and mammals
c all vertebrates
d mammals only
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Explanation:

For the first question: The systemic circuit carries oxygenated blood from the left side of the heart. Oxygenated blood enters the left atrium, moves to the left ventricle, is pumped through the aorta to arteries, then capillaries (where gas exchange occurs), and returns to the heart via veins.
For the second question: Double circulation with a four-chambered heart (separating oxygenated and deoxygenated blood) is characteristic of birds and mammals, ensuring efficient oxygen delivery to tissues. Amphibians/reptiles have incomplete double circulation or three-chambered hearts; not all vertebrates have this system.

Answer:

First question: A. left atrium→left ventricle→aorta→arteries→capillaries→veins
Second question: B. birds and mammals