Nerves

Electrical conductivity is important because we live in a world that is increasingly run by electronic devices. These devices depend on materials that are electrically conductive to send their signals and operate.

green? yellow like cheese. http://hyperphysics.phy-astr.gsu.edu/hbase/vision/retina.html

There are four types of tissue found in the human body. These are epithelial tissue, connective tissue, nervous tissue and muscle tissue. Percentage composition of tissue varies from person to person.

The rights for Bobbs-Merrill Co are currently controlled by Random House, a division of Penguin Random House. Bobbs-Merrill Co was acquired by Macmillan in 1985, which was later merged into what is now Penguin Random House.

Giant multipolar neurons can be found in the central nervous system of vertebrates, particularly in the spinal cord and some parts of the brainstem. They are known for their large cell bodies and multiple dendritic projections that receive and integrate signals from other neurons.

Since epithelium needs to serve as both a barrier and selectively permeable membrane, the cells need to be tightly junctioned to one another (thus prohibiting paracellular transport) and need to express channels, transporters or exchangers to allow for movement of selected ions/molecules across the epithelial barrier

Santiago Ramón y Cajal referred to neurons as the "butterflies of the soul" to highlight their delicate and intricate nature, much like the graceful and beautiful form of a butterfly. He believed that neurons were responsible for our thoughts, emotions, and consciousness, making them essential for understanding the workings of the mind and soul.

the technical term for spore sac I believe is ascii.

Some neurotransmitter molecules have a molecular structure that precisely fits the receptor site on the receiving neuron, much as a key fits a lock. When the agonist molecule excites, it is similar enough in structure to the neurotransmitter molecule that it mimics its effects on the receiving neuron. Morphine, for instance, mimics the action of endorphins by stimulating receptors in brain areas involved in mood and pain sensations. This antagonist molecule inhibits. It has a structure similar enough to the neurotransmitter to occupy its receptor site and block its action, but not similar enough to stimulate the receptor.

A neuron is what your nervous tissue is made of. It transmits information in the form of electro-chemical changes, which are called nerve impulses.

=== All neurons have three main parts: 1. a cell body which contains a nucleus. 2. dendrites, which are extensions off of the cell body that receive the signals. They are hair-like structures. and 3. An axon, which is what sends out the neuron's signals. It is also an extension from the cell body, but a larger one than the dendrites. It is encased in a faty sheath and there is only one of these per neuron.

The function is to catch/take impulses from the central nervous system and send it to muscles and glands

Axons transmit signals away from the cell body.

Dendrites transmit signals into the cell body.

Axons also tend to be much longer than dendrites.

Dendrites are the branched projections of a neuron that act to conduct the electrical stimulation received from other neural cells to the cell body, or soma, of the neuron from which the dendrites project. Electrical stimulation is transmitted onto dendrites by upstream neurons via synapses which are located at various points throughout the dendritic arbor. Dendrites play a critical role in integrating these synaptic inputs and in determining the extent to which action potentials are produced by the neuron. An axon or nerve fiber, is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma.

Denervation hypersensitivity occurs in multiple sclerosis. In multiple sclerosis demyelination of oligodendrocytes in the central nervous system and Schwann cells in the peripheral nervous system result in disruption of communication between upper motor neurons in the brain and the lower motor neurons in the gray matter of the spinal cord. The end result is denervation hypersensitivity with physical symptoms of increased muscle tone, difficulty controlling muscles, exaggerated reflexes, and muscle spasms.

The auditory tube, also known as the Eustachian tube, connects the middle ear to the nasopharynx. This connection helps to equalize pressure between the middle ear and the environment, allowing for proper hearing function and ventilation of the middle ear.

In clinical settings, assessment involves evaluating a patient's physical, mental, and emotional health to diagnose and treat medical conditions. This includes taking medical histories, conducting physical examinations, and ordering tests. In non-clinical settings, assessment refers to the process of evaluating individuals or groups to measure knowledge, skills, abilities, or behaviors in educational, organizational, or research settings. This can involve using tests, surveys, observations, or interviews to gather data for decision-making and goal-setting purposes.

may be there are specific arrangement of sodium and potassium ion channels in neurons which is not found in any other cell andthis arrangement is necessary for action potential generation but i am ot sure what kind of arrangement is needed for action potential generation and what kind is presentr in neurons and other cells .

Mylein is Fat, and is white.

Answer #2 Myelin is actually a cell covering the "shaft" of a nerve axon, improving conduction across the cell as a whole. It doesn't hold stain as well, and generally appears whiter than unmyelinated cells, so they are white. Myelin isn't fat.

There is no definite number of antigens in the human body as the immune system can recognize a wide range of foreign substances. Antigens can come from pathogens like bacteria and viruses, as well as from our own cells in cases of autoimmune diseases. The human body constantly encounters new antigens and can generate immune responses against them.

The human nervous system consists of billions of nerve cells (or neurons)plus supporting (neuroglial) cells. Neurons are able to respond to stimuli (such as touch, sound, light, and so on), conduct impulses, and communicate with each other (and with other types of cells like muscle cells).

Neurons can respond to stimuli and conduct impulses because a membrane potential is established across the cell membrane. In other words, there is an unequal distribution of ions (charged atoms) on the two sides of a nerve cell membrane.

The membranes of all nerve cells have a potential difference across them, with the cell interior negative with respect to the exterior (a). In neurons, stimuli can alter this potential difference by opening sodium channels in the membrane. For example, neurotransmitters interact specifically with sodium channels (or gates). So sodium ions flow into the cell, reducing the voltage across the membrane.

Once the potential difference reaches a threshold voltage, the reduced voltage causes hundreds of sodium gates in that region of the membrane to open briefly. Sodium ions flood into the cell, completely depolarizing the membrane (b). This opens more voltage-gated ion channels in the adjacent membrane, and so a wave of depolarization courses along the cell - the action potential.

As the action potential nears its peak, the sodium gates close, and potassium gates open, allowing ions to flow out of the cell to restore the normal potential of the membrane.

Membranes are polarized or, in other words, exhibit a RESTING MEMBRANE POTENTIAL. This means that there is an unequal distribution of ions (atoms with a positive or negative charge) on the two sides of the nerve cell membrane. This POTENTIAL generally measures about 70 millivolts (with the INSIDE of the membrane negative with respect to the outside). So, the RESTING MEMBRANE POTENTIAL is expressed as -70 mV, and the minus means that the inside is negative relative to (or compared to) the outside. It is called a RESTING potential because it occurs when a membrane is not being stimulated or conducting impulses (in other words, it's resting).

Source : Internet.

The space between neurons is called the synaptic cleft. It is where neurotransmitters are released by the presynaptic neuron, travel across the cleft, and bind to receptors on the postsynaptic neuron to transmit chemical messages.

Yes, sound waves travel through the external auditory canal and cause the eardrum to vibrate. These vibrations are then transmitted through the middle ear bones to the inner ear, where they stimulate hair cells in the cochlea. The hair cells convert the vibrations into electrical signals that are sent to the brain via the auditory nerve.

It does the functions of a cell such as endocytosis, exocytosis. It also contains all the regular organelles of an animal cell. Mitosis will make ATP in order for the cell to conduct electricity and other active transporting.

Neurons communicate with each other through electrical and chemical signals. When an action potential is generated in one neuron, it travels down the axon and releases neurotransmitters at the synapse, which then bind to receptors on the neighboring neuron, causing either excitation or inhibition of the receiving neuron.