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solar system😎

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computer

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systems; solar systems; telephone

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LOL

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schedule

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everything

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water system

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cool

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I'm excited to try to act :)and scared of people looking at me :(

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state system solar system organism systems

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state system solar system organism systems

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natural sytem

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Even the simplest animals are exceedingly complicated. Advanced vertebrates like birds and mammals are composed of so many deeply intermeshed, mutually dependent moving parts that it can be hard for a non-biologist to keep track. Below are the 12 organ systems shared by most higher animals.

The Respiratory System

All cells need oxygen, the crucial ingredient for extracting energy from organic compounds. Animals obtain oxygen from their environment with their respiratory systems. The lungs of land-dwelling vertebrates gather oxygen from the air, the gills of ocean-dwelling vertebrates filter oxygen from the water, and the exoskeletons of invertebrates facilitate the free diffusion of oxygen (from water or air) into their bodies. The respiratory systems of animals also excrete carbon dioxide, a waste product of metabolic processes that would be fatal if left to accumulate in the body.

The Digestive System

Animals need to break down the food they eat into its essential components in order to fuel their metabolism. Invertebrate animals have simple digestive systems-in one end, out the other (as in the case of worms or insects). But all vertebrate animals are equipped with some combination of mouths, throats, stomachs, intestines, and anuses or cloacas, as well as organs (such as the liver and pancreas) that secrete digestive enzymes. Ruminant mammals such as cows have four stomachs in order to efficiently digest fibrous plants.

The Integumentary System

The integumentary system consists of the skin and the structures or growths that cover it (the feathers of birds, scales of fish, hair of mammals, etc.), as well as claws, nails, hooves, and the like. The most obvious function of the integumentary system is to protect animals from the hazards of their environment, but it's also indispensable for temperature regulation (a coating of hair or feathers helps to preserve internal body heat), protection from predators (the thick shell of a turtle makes it a tough snack for crocodiles), sensing pain and pressure, and, in humans, even producing important biochemicals like Vitamin D.

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Animals Can't Live Without These 12 Organ Systems

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Even the simplest animals are exceedingly complicated. Advanced vertebrates like birds and mammals are composed of so many deeply intermeshed, mutually dependent moving parts that it can be hard for a non-biologist to keep track. Below are the 12 organ systems shared by most higher animals.