PLEASE HURRY 80 POINTS Circulatory System This system delivers and to all the in the

body and and to the through blood vessels.

The main organ is the (the pump).

The blood vessels - arteries, veins, and .

Two systems in one:

1. Pulmonary circulation – sends blood from the to the

and back

2. Systemic circulation – sends blood to the rest of the

and back to the heart

Pulmonary Circulation

The are where the oxygen and nutrients are picked up by

the blood.

Also, where the carbon dioxide and other waste is from

the blood.

This happens in the (air sacs) of the lungs.

Systemic Circulation

Provides organs, tissues and cells with , so they get oxygen

and other nutrients.

Accomplished through the : veins, arteries and capillaries

The largest blood vessels have names.

Main Blood Vessels

Aorta is the main of the heart carrying oxygenated blood to all

parts of the body except the .

Vena Cava large carrying deoxygenated blood back to the heart.

Superior Vena Cava returns blood from the body.

Inferior Vena Cava returns blood from the body.

Mg is used to measure mass

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.