Beatrice Lang
Nervous tissue is found in the brain, spinal cord, and nerves, and is responsible for coordinating and controlling many bodily activities. Nervous tissue is specialized to conduct electrical signals from one structure in the body to another. The cells in nervous tissue that generate and conduct impulses are called neurons or nerve cells. These cells have three principal parts: the dendrites, the cell body, and one axon. Neurons are not intrinsically good conductors of electricity, but they have evolved mechanisms for generating electrical signals based on the flow of ions across their plasma membranes.
| Characteristics | Values |
|---|---|
| Tissue that carries electrical signals | Nervous tissue |
| Types of nervous tissue | Neurons, Neuroglia or glial cells |
| Types of neurons | Afferent or sensory neurons, Efferent or motor neurons, Interneurons or association neurons |
| Parts of neurons | Dendrites, Cell body, Axon |
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What You'll Learn
- Nervous tissue is responsible for carrying electrical signals in the body
- Nerve cells, or neurons, transmit information via electrical signals
- Neurons are the only cells in nerve tissue that transmit impulses
- Neuroglia cells support neurons but do not transmit impulses
- Neurons are classified as afferent, efferent, or interneurons
Nervous tissue is responsible for carrying electrical signals in the body
Nervous tissue is one of the four primary tissue types found in the human body. It is responsible for carrying electrical signals in the body. Nervous tissue is found in the brain, spinal cord, and nerves. It plays a crucial role in coordinating and controlling various body activities.
Nerves, which are made up of nervous tissue, transmit electrical signals that enable us to feel sensations and move our muscles. They also regulate essential automatic functions, such as breathing, maintaining heart rate, and digesting food. These electrical signals are generated by nerve cells, also known as neurons, which have evolved mechanisms to produce electrical signals based on the movement of ions across their plasma membranes.
The neurons in nervous tissue have three main components: dendrites, the cell body, and an axon. Dendrites are extensions that carry impulses towards the cell body, while the axon carries impulses away from the cell body. The cell body is responsible for carrying out the general functions of the nerve cell.
The electrical signals generated by neurons are transmitted along the cell membrane and are essential for communication within the nervous system. These signals enable the nervous system to control voluntary movement, senses, blood pressure, heart rate, and stress response. Additionally, they facilitate the transmission of signals between the central nervous system, which includes the spinal cord and brain, and the peripheral nervous system, which comprises nerves transmitting signals from the body to the spinal cord.
In conclusion, nervous tissue is responsible for carrying electrical signals in the body. This tissue type, through the functions of neurons and nerves, plays a vital role in coordinating bodily functions, transmitting sensations, and facilitating movement.
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Nerve cells, or neurons, transmit information via electrical signals
Nervous tissue is specialized to conduct electrical signals from one structure in the body to another. Nerve cells, or neurons, are the cells that transmit information via electrical signals.
Neurons are not inherently good electricity conductors, but they have evolved intricate mechanisms for generating electrical signals based on the flow of ions across their plasma membranes. The nerve cell's selective permeability to various ions and the normal distribution of these ions across the cell membrane determine the generation of both the resting potential and the action potential. The resting membrane potential is a negative potential that neurons ordinarily generate and can be measured by recording the voltage between the inside and outside of nerve cells.
The action potential eliminates the negative resting potential and momentarily makes the transmembrane potential positive. Action potentials are propagated along the length of axons and are the fundamental signal that carries information from one place to another in the nervous system. An action potential is sometimes referred to as "firing." It occurs when depolarization exceeds a certain threshold, and an impulse travels along the neuron.
Neurotransmitters are essential for transmitting electrical signals between cells. They are released from presynaptic terminals, which may branch out to communicate with several postsynaptic neurons. Each neuron releases only a few types of neurotransmitters, but they can carry receptors for various types of neurotransmitters. Neurotransmitters such as dopamine can either excite or inhibit further electrical signals.
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Neurons are the only cells in nerve tissue that transmit impulses
Nerve tissue is one of the four basic types of tissue found in the human body. Nervous tissue is specialised to conduct electrical signals from one structure in the body to another. Neuroglia cells, for example, support, nourish and protect neurons but do not conduct nerve impulses.
Neurons are nerve cells that generate electrical signals to transmit information. They are the only cells in nerve tissue that transmit impulses. They have three main components: dendrites, the cell body, and the axon. Dendrites are thin fibres that extend from the cell in branched tendrils to receive information from other neurons. The cell body carries out most of the neuron's basic cellular functioning. The axon is a long, thin fibre that carries nerve impulses to other neurons.
Electrical signals are conveyed along the cell membrane within cells. For communication between cells, electrical signals are converted into chemical signals conveyed by small messenger molecules called neurotransmitters. Neurotransmitters bind to receptors that act as ligand-gated ion channels, causing them to open or close in response to neurotransmitters or changes in the cell's membrane potential.
Neurotransmitters that bind to second messenger-linked receptors, such as dopamine, initiate a complex cascade of chemical events that can either excite or inhibit further electrical signals. These signals are transmitted across the synaptic cleft, the space between one neuron and another.
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Neuroglia cells support neurons but do not transmit impulses
The nervous system is made up of neurons and glia. Neurons are nerve cells that can transmit electrical signals, whereas glia, or neuroglia, are non-neuronal cells that provide support functions for neurons. Glial cells do not directly participate in electrical signalling, but they play a crucial role in maintaining the signalling abilities of neurons.
Neuroglia are of two types: central nervous system (CNS) glia and peripheral nervous system (PNS) glia. CNS glia include macroglia and microglia, with astrocytes, oligodendrocytes, and NG2-glia (polydendrocytes) being the main macroglia cell types. Astrocytes provide nutrients and other substances to neurons, regulate ion concentrations in the extracellular fluid, and form the blood-brain barrier to protect the brain from toxic substances. Oligodendrocytes myelinate and support axons, while NG2-glia act as oligodendrocyte precursors. Microglia, on the other hand, scavenge and degrade dead cells and protect the brain from microorganisms.
PNS neuroglia include Schwann cells, satellite glial cells, olfactory ensheathing cells, and enteric glia. Schwann cells cover axons, while satellite glial cells provide nutrients and structural support for neurons in peripheral ganglia. Olfactory ensheathing cells and enteric glia are also part of the PNS glia. Both CNS and PNS neuroglia are essential for normal bodily function, providing homeostatic, structural, and metabolic support for neurons.
While neuroglia do not transmit electrical impulses directly, they play a crucial role in supporting neurons and maintaining their signalling capabilities. They help define synaptic contacts, regulate ion concentrations, provide structural support, and protect the nervous system. This support enables neurons to effectively transmit electrical signals, highlighting the importance of neuroglia in the overall functioning of the nervous system.
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Neurons are classified as afferent, efferent, or interneurons
Nervous tissue is specialized to conduct electrical signals from one structure in the body to another. Nerve cells, or neurons, are vital for communication and coordination between the brain and the body. Neurons can be classified as afferent, efferent, or interneurons.
Afferent neurons carry information from sensory receptors in the skin and organs to the central nervous system (CNS), which includes the brain and spinal cord. They are sometimes called sensory neurons because they transmit information related to senses like vision, hearing, smell, taste, touch, pain, and temperature. Afferent neurons have a unique structure, with their cell bodies located just outside the spinal cord. They have long dendrites to receive signals and short axons to pass them to the CNS.
Efferent neurons, on the other hand, carry motor information away from the CNS to the muscles and glands of the body. These neurons instruct muscles to contract or relax, enabling movement. They also control glands, influencing the production of substances like hormones. Efferent neurons have their cell bodies located in the spinal cord, and their axons leave the spinal cord through the ventral root.
Interneurons, also called relay neurons, act as connectors or intermediaries between afferent and efferent neurons within the CNS. They ensure that signals are appropriately relayed within the nervous system, allowing for effective communication between different parts of the body.
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Frequently asked questions
Nervous tissue carries electrical signals in the body.
The four primary tissue types found in the human body are epithelial, connective, muscle, and nerve tissue.
The cells in nervous tissue are called neurons or nerve cells.
Neurons are the "conducting" cells that transmit impulses and the structural unit of the nervous system.
