What Characteristics Are Shared By All Animals?
10.1: Animal Characteristics
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Is an insect an animal?
Of course it is. Is a snail an insect? No, snails are mollusks. Find the large "foot" that allows movement, and the antennas are obvious. Really, a snail'south eyes are on the two long projections on its caput, and the projections are chosen eyestalks. These are characteristics of this fauna.
Characteristics of Animals
Animals are a kingdom of multicellular eukaryotes. They cannot brand their ain food. Instead, they go nutrients by eating other living things. Therefore, animals are heterotrophs.
Animal Cells
Like the cells of all eukaryotes, animal cells have a nucleus and other membrane-jump organelles (see Effigy beneath). Unlike the cells of plants and fungi, animal cells lack a cell wall. This gives animal cells flexibility. Information technology lets them accept on different shapes so they tin can become specialized to do particular jobs. The man nervus prison cell shown in Effigy below is a adept example. Its shape suits its function of transmitting nerve impulses over long distances. A nerve cell would exist unable to take this shape if information technology were surrounded past a rigid jail cell wall.
Animal Cell. The shape of an fauna jail cell is not constrained by a rigid prison cell wall. A bacterial cell is shown above for comparison.
Human Nerve Cell. A man nerve cell is specialized to transmit nerve impulses. How do you remember the jail cell'south shape helps it perform this function?
Animal Structure and Office
Animals non but have specialized cells. Most animals as well have tissues and organs. In many animals, organs course organ systems, such as a nervous system. Higher levels of organization let animals to perform many complex functions. What tin animals exercise that most other living things cannot? Most animals share these characteristics: sensory organs, motion, and internal digestion. All of them are illustrated in Effigy below.
- Animals can detect ecology stimuli, such as light, sound, and affect. Stimuli are detected past sensory nerve cells. The data is transmitted and processed by the nervous system. The nervous system, in turn, may direct the body to respond.
- All animals tin can move, at least during some stage of their life wheel. Muscles and nerves work together to allow motility. Being able to movement lets animals actively search for food and mates. Information technology too helps them escape from predators.
- Near all animals have internal digestion of nutrient. Animals eat other organisms and may use special tissues and organs to digest them. (Many other organisms absorb nutrients directly from the environment.)
Almost animals share these characteristics: sensory organs, movement, and internal digestion.
Animal Life Cycle and Reproduction
Many animals have a relatively simple life cycle. A general animal life cycle is shown in Effigy below. Most animals spend the bulk of their life as diploid organisms. Only about all animals reproduce sexually. Diploid adults undergo meiosis to produce sperm or eggs.Fertilization occurs when a sperm and an egg fuse. The zygote that forms develops into an embryo. The embryo eventually develops into an adult.
Animate being Life Cycle. An beast life bicycle that includes but sexual reproduction is shown hither. Some animals too reproduce asexually. How does the animal life bicycle compare with the life wheel of a plant?
Summary
- Animals are multicellular eukaryotes that lack prison cell walls.
- All animals are heterotrophs.
- Animals have sensory organs, the ability to move, and internal digestion. They besides have sexual reproduction.
Review
- Place traits that characterize all animals.
- Land one way that brute cells differ from the cells of plants and fungi. What is the significance of this difference?
- Describe creature digestion.
- Describe a full general brute life cycle.
Source: https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_Introductory_Biology_(CK-12)/10%3A_Animals/10.01%3A_Animal_Characteristics
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