do all animals have nervous tissue
Blood tissue contains all the blood in a living body. why do radially symmetrical animals have no single concentration of nervous tissue or sensory oragans? connecting bones to each other, muscles to bones etc.). This tissue is most widely distributed connective tissue in the animal body. Nervous tissue consists of two cells: nerve cells or neurons and glial cells, which helps transmit nerve impulses and also provides nutrients to neurons. The contraction and relaxation of these cells result in movement. Nervous tissues are made of cells specialized to receive and transmit electrical impulses from specific areas of the body and to send them to specific locations in the body organized into structures called nerves. These three types of nerve cells coordinate with each other to receive external stimuli and to transmit the impulse to muscles or glands of the body for an appropriate response to the stimulus. Tissues are groups of cells that have a similar structure and act together to perform a specific function. How do these body parts move? Nervous Tissues. The large structure with a central nucleus is the cell body of the neuron. • Nervous tissue is made of nerve cells and enables coordinated movement and response to stimuli. To do all these things, cells in nervous tissue need to be able to communicate with each other by way of electrical nerve impulses. There are four types of tissues in animals namely: All other animal species, with the exception of a few types of worm, have a nervous system containing a brain, a central cord (or two cords running in parallel), and nerves radiating from the brain and central cord. Locomotion and movements are due to muscular tissues contain highly contractile muscle cells. Let us learn more about them. It is the main component of nervous tissue in all animals except sponges and placozoa. They are usually in contact with one another on a definite basement membrane. Nerve tissue is made by nerves or nerve cells. Macrophages, lymphocytes, and, occasionally, leukocytes can be found in some of the tissues. Learn Vocabulary, Terms, And More With Flashcards, Games, And Other Study Tools. Astrocytes regulate the chemical environment of the nerve cell, and oligodendrocytes insulate the axon so the electrical nerve impulse is transferred more efficiently. Collections of tissues joined in units to serve a common function compose organs. Nervous tissue is grouped into two main categories: neurons and neuroglia. We're sorry, but in order to log in and use all the features of this website, you will need to enable JavaScript in your browser. Some tissues have specialized cells that are not found in the others. 7. The nervous systems of ctenophores (comb jellies) and cnidarians (e.g., anemones, hydras, corals and jellyfishes) consist of a diffuse nerve net. Recall that tissues are groups of similar cells carrying out related functions. Internal and external surface covering layer is known as epithelial tissue. Glial Cells . Nervous systems are found in almost all multicellular animals, but vary greatly in complexity. In plants, tissues are divided into three types: vascular, ground, and epidermal. If this latter view were true, it would imply that placozoans are secondarily simplified from more complex ancestors that had a nervous system. Let us have a glimpse of each type of animal tissue in detail. M.M. — of the body. Collections of tissues joined in units to serve a common function compose organs. The main cell of the nervous system is the neuron, illustrated in the figure below. An important part of the function of neurons is in their structure, or shape. The size of the nervous system ranges from a few hundred cells in the simplest worms, to around 300 billion cells in African elephants. Q: Where is the nervous tissue located in the body? Cardiac muscle cells have striations, but, unlike the multinucleate skeletal cells, they have only one nucleus. Nervous tissue is the term for groups of organized cells in the nervous system, which is the organ system that controls the body’s movements, sends and carries signals to and from the different parts of the body, and has a role in controlling bodily functions such as digestion. Recall that tissues are groups of similar cells carrying out related functions. Nervous Tissue Definition.
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