During middle adulthood, aerobic capacity declines as ______.
A) less oxygen is taken into the lungs and less blood is pumped by the heart
B) sensitivity to insulin is lost by the muscle tissues
C) lean-body mass, which includes fat, is replaced by muscle
D) large amounts of calcium are lost by the bones, making them porous and brittle

Question

Quizplus · Accepted Answer

During middle adulthood, aerobic capacity declines primarily because less oxygen is taken into the lungs and less blood is pumped by the heart. This affects the body's efficiency in utilizing oxygen for energy production during physical activities.

During Middle Adulthood, Aerobic Capacity Declines as ______