The Living World 8th Edition by George Johnson

تمرين 14

The four-chambered heart and double-loop vessel system are thought to be important in the evolution of
A) locomotion.
B) ectothermy.
C) exothermy.
D) endothermy.
When major arteries become partially blocked by deposits of plaque, the heart's left ventricle must work harder and harder to pump enough blood, and the heart eventually becomes weakened and begins to fail. This condition, known as congestive heart failure, often leads to fatal pulmonary edema (accumulation of fluid). Explain why.
A molecule of CO₂ that is generated in the cardiac muscle of the left ventricle would not pass through which of the following structures before leaving the body?
A) right atrium
B) left atrium
C) right ventricle
D) left ventricle