A patient has a heart condition in which the left ventricle pumps blood inefficiently. What is the most immediate effect on the body's transport system?
Reduced oxygen delivery to body tissues
The left ventricle receives oxygen-rich blood from the lungs (through the left atrium) and pumps it into the aorta, which carries it to all the organs and tissues of the body through the systemic circulation.
If the left ventricle pumps inefficiently, less oxygenated blood is sent out with each beat, so the cardiac output falls. The first and most direct consequence for the transport system is that less oxygen reaches the body tissues, which can cause tiredness and breathlessness on exertion.
Carbon dioxide does not build up immediately, because blood still flows and the lungs still remove it. A weak left ventricle does not instantly raise pressure in the major veins of the body; back-pressure develops first in the lung circulation and only gradually. A faster resting heart rate may appear later as the body tries to make up for the poor pumping, so it is not the immediate effect on transport.
Hence, Reduced oxygen delivery to body tissues.
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