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What muscles innervated by ulnar nerve?
The ulnar nerve innervates several muscles in the forearm and hand. In the forearm, it primarily innervates the flexor carpi ulnaris and the medial half of the flexor digitorum profundus. In the hand, it innervates most of the intrinsic muscles, including the hypothenar muscles, the adductor pollicis, and the interossei muscles, as well as the medial two lumbricals. This nerve plays a crucial role in fine motor control and grip strength.
A bundle of neurons form at?
A bundle of neurons forms at the intersection of axons and dendrites, where they communicate through electrical and chemical signals. This network allows for the transmission of information throughout the brain and nervous system, enabling various functions such as memory, thought, and movement.
When several neurons are stimulated equally which one will fire first?
The neuron with the lowest threshold potential will fire first when several neurons are stimulated equally. Threshold potential is the minimum level of depolarization needed to trigger an action potential in a neuron. Neurons with lower threshold potentials are more excitable and will fire before neurons with higher threshold potentials.
What functional advantages a neuron with several have over a neuron with only one dendrite?
These are also called multipolar neurons and they allow for the integration of a great deal of information from other neurons.
Why does acetylcholine causes vaso-dilation?
In some muscle tissue acetylcholine causes vaso-dilation, but not all. Norepinephrine is the opposite competor/effector of acetylcholine. Acetylcholine is present in all preganglionic fibers, both parasympathetic and sympathetic. Acetylcholine is present in postganglionic parasympatic fibers, where norepinephrine is present in the postganglionic sympathetic fibers. In some tissues acetylcholine causes constriction. Can also reduce heart rate vi the vagus nerve. Acetylcholine is the only neurotransmitter used in the somatic nervous system! Acetylcholine can effect vasodilation by several mechanisms, including activation of endothelial nitric oxide (NO) synthase and prostaglandin (PG) production. In human skin, exogenous Acetylcholine increases both skin blood flow and bioavailable NO levels, but the relative increase is much greater in skin blood flow than NO. So this may lead us to speculate that acetylcholine may dilate cutaneous blood vessels through PGs, as well as NO. In some muscle tissue acetylcholine causes vaso-dilation, but not all. Norepinephrine is the opposite competor/effector of acetylcholine. Acetylcholine is present in all preganglionic fibers, both parasympathetic and sympathetic. Acetylcholine is present in postganglionic parasympatic fibers, where norepinephrine is present in the postganglionic sympathetic fibers. In some tissues acetylcholine causes constriction. Can also reduce heart rate vi the vagus nerve. Acetylcholine is the only neurotransmitter used in the somatic nervous system! Acetylcholine can effect vasodilation by several mechanisms, including activation of endothelial nitric oxide (NO) synthase and prostaglandin (PG) production. In human skin, exogenous Acetylcholine increases both skin blood flow and bioavailable NO levels, but the relative increase is much greater in skin blood flow than NO. So this may lead us to speculate that acetylcholine may dilate cutaneous blood vessels through PGs, as well as NO.
In addition to the nucleus cytoplasm and cell membrane a single neuron possesses what?
A single neuron also possesses dendrites, which receive signals from other neurons, and an axon, which transmits signals to other neurons or cells. Additionally, neurons have synaptic connections that allow them to communicate with other neurons or cells through neurotransmitters.
How many neurons are there in your eyes?
The human retina, which is part of the eye, contains approximately 100 million photoreceptor cells (rods and cones) and several other types of neurons, including bipolar cells and ganglion cells. In total, the retina has around 1 to 1.5 million ganglion cells, which send visual information to the brain. While the exact number of neurons in the entire eye varies, it's estimated that there are several million neurons involved in processing visual information.
What is an adrenoreceptor?
An adrenoreceptor is an adrenergic receptor, any of several sites in the surface membranes of cells innervated by adrenergic neurons.
What is an adrenergic receptor?
An adrenergic receptor is any of several sites in the surface membranes of cells innervated by adrenergic neurons.
What are the two main cells of the brain?
Generally, these would be the neurons and the supportive cells. Supportive cells, however, comprise several different kinds of cells. These include oligodendrocytes, glial cells, schwann cells, astrocytes, etc.
When nerve impulses from several presynaptic neurons stimulate a single postsynaptic neuron at the same time it is called?
chemical synapse
What is a bundle of neurons held together by several layers of connective tissue?
A bundle of neurons held together by several layers of connective tissue is called a nerve. Nerves transmit signals between the brain, spinal cord, and various parts of the body, allowing for communication and coordination of bodily functions.
