Examlex
A _______________ binds to the same site as a neurotransmitter,prevents a neurotransmitter from binding to the receptor,and fails to activate the receptor.
Vascular System
The complex network of blood vessels that circulate blood throughout the body, including arteries, veins, and capillaries.
Capillaries
The smallest blood vessels in the body, which facilitate the exchange of oxygen, carbon dioxide, and other nutrients and wastes between the blood and tissues.
Blood
The circulatory fluid that supplies oxygen and nutrients to the cells and carries away carbon dioxide and other waste products.
Cardiorespiratory Fitness
A measure of the efficiency of the heart, lungs, and vascular system in delivering oxygen to the body during sustained physical activity.
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