A physiological change in the cardiovascular system that occurs due to aging is ______.

A) red blood cells become less able to carry oxygen
B) the heart becomes too flexible
C) the heart becomes less responsive to signals to contract
D) arteries decrease in rigidity

Cardiovascular System

The system in the body that circulates blood and lymph through the heart, arteries, veins, and capillaries, delivering oxygen and nutrients to organs and tissues and carrying away waste products.

Red Blood Cells

The cells in the blood that carry oxygen to the body's tissues and remove carbon dioxide.

Arteries

Blood vessels that carry oxygen-rich blood away from the heart to the body's tissues and organs.