The human cardiovascular system is considered closed because
a. blood is continuously circulated in the body.
b. blood provides nutrients to organs.
c. blood collects oxygen from the lungs
d. there are no holes for blood to enter or leave the system

d. there are no holes for blood to enter or leave the system

The cardiovascular system is also known as the circulatory system.

It is made up of the heart, the blood vessels namely arteries, veins and capillaries, and approximately five liters of blood.

The circulatory system's major functions are to transport  oxygen, hormones, and nutrients to every cell in the body, and to tale away cellular waste products from the cells such as carbon dioxide  and bring them to excretory organs  where they are expelled out of the body.

i'm sorry, but can you list the answers? i cannot with something i don't know the answers to

,

chris

earthquakes in florida are rare because the state is not located near any tectonic plates. in fact, florida is tied for first place as having the fewest earthquakes of any state. much of florida is limestone and seafloor materials that is not conducive to earthquakes.

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