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Which is the control centre of a reflex action?
The nervous system.
Where does each neuron in the CNS receive its input?
Each neuron in the CNS receives input from other neurons through synapses, which are specialized junctions where signals are transmitted from one neuron to another. These synapses can be excitatory or inhibitory, meaning they either increase or decrease the likelihood of the receiving neuron firing an action potential.
The fundamental cell type that conducts an action potential in the nervous system is a?
neuron
Are Action potentials are the language in the nervous system or endocrine system?
Action potentials are primarily the language of the nervous system. They are electrical signals that transmit information along neurons and facilitate communication between nerve cells. In contrast, the endocrine system communicates through hormones, which are chemical messengers released into the bloodstream. Therefore, while both systems are vital for body function, action potentials specifically pertain to the nervous system.
What is permissive action as in the nervous system?
In the nervous system, permissive action refers to one neurotransmitter enhancing the effect of another neurotransmitter. This occurs when one neurotransmitter prepares receptors to be more responsive to another neurotransmitter, allowing for a more amplified response.
How do anti depressants work?
Antidepressants work by increasing the quantity and action of all or some of the neurotransmitters, namely (1)serotonin, (2)dopamine, (3) norepinephrine at the synapses in brain in a person suffering from depression.
A drug that increases the action of the central nervous system the heart and other organs?
A drug that increases the action of the central nervous system, heart, and other organs is known as a stimulant. Stimulants can increase alertness, attention, and energy levels by enhancing the activity of neurotransmitters like dopamine and norepinephrine in the brain. Examples of stimulants include caffeine, amphetamines, and cocaine.
What is the mean excited?
The quality of being readily excited; proneness to be affected by exciting causes., The property manifested by living organisms, and the elements and tissues of which they are constituted, of responding to the action of stimulants; irritability; as, nervous excitability.
What are some side effects of central nervous system stimulants?
The most common adverse effects of CNS stimulants are associated with their primary action. Typical responses include overstimulation, dizziness, restlessness, and similar reactions. Rarely, hematologic reactions.
What are cholinergic stimulants?
they stimulate the action of ACh at post ganglionic muscarinic receptors.
How Nervous system carries message?
The nervous system carries messages through a network of nerve cells called neurons. When a stimulus is detected, electrical signals are generated in the neurons and travel along the nerve cells in the form of action potentials. These action potentials allow for communication between different parts of the body and are transmitted across synapses to relay messages between neurons.
Describe the general structure of a synapse?
Synapses occur between two neurons. Electrical activitiy in the pre-synaptic neuron influences the post-synaptic neuron. There are two types of synapses in the body: Electrical and chemical. Electrical synapses occur in pre and post synaptic neurons that are joined via gap junctions. Currents from action potentials flow across the junction through channels called connexons. This current will depolarize the membrane of the post synaptic neuron to threshold, which will continue the action potential in the cell. Electrical synapses are fast and bidirectional. However, they are mainly found in cardiac and smooth muscles, and not in the mammalian nervous system.Chemical synapses use neurotransmitters. Depolarization occurs in the pre-synaptic neuron and calcium ions rush in. The calcium ions activate neurotransmitter release into the synaptic cleft. The neurotransmitters reach the post-synaptic neuron and cause action potentials to develop.Note: this can go into much more detail
What is the difference between an excitatory synapse and an inhibitory synapse?
Synapses are junctions that allow a neuron to electrically or chemically transmit a signal to another cell. Synapses can either be excitatory or inhibitory. Inhibitory synapses decrease the likelihood of the firing action potential of a cell while excitatory synapses increase its likelihood. Excitatory synapses cause a positive action potential in neurons and cells. For example, in the neurotransmitter Acetylcholine (Ach), its binding to receptors opens up sodium channels and allows an influx of Na+ ions and reduces membrane potential which is referred to as Excitatory Postsynaptic potential(EPSP). An action potential is generated when the polarization of the postsynaptic membrane reaches threshold. ACh acts on nicotinic receptors which can be found at the neuromuscular junction of skeletal muscles, the parasympathetic nervous system, and the brain. It also acts on muscarinic receptors found at neuromuscular junctions of the smooth muscles, glands, and the sympathetic nervous system. Inhibitory synapses, on the other hand, cause the neurotransmitters in the postsynaptic membrane to depolarize. An example is the neurotransmitter Gamma Aminobutyric Acid (GABA). The binding of GABA to receptors increases the flow of chloride (CI-) ions in the postsynaptic cells raising its membrane potential and inhibiting it. The binding of GABA to receptors activates a second messenger opening potassium channels.
What do depressants do to the body?
i dont know if its a.restlessness b.to dull the appetite c.increased activity d.faster heart rate e.always harmful please answer question need help! let me guess plato..
Are asthma medication a stimulant or depressant?
Asthma medications can vary in their effects, but most commonly, bronchodilators, such as albuterol, are considered stimulants because they work by relaxing the muscles around the airways, leading to improved airflow. These medications stimulate the beta-2 adrenergic receptors in the lungs. On the other hand, corticosteroids used for asthma management have a different action and are not classified as either stimulants or depressants; they reduce inflammation in the airways. Overall, the classification depends on the type of medication used.
What part of the neuron transmits messages to the muscles?
Afferent (sensory) division of the nerve cell receives input messages. The ends are called dendrites. A typical neuron in the central nervous system (CNS) has many thousand dendrites. It is the dendrites that receive the nervous signals from other neurons via connections called synapses.
Which types of electrical signals allow rapid long-distance communication within the nervous system?
Action potentials are the electrical signals that allow for rapid long-distance communication within the nervous system. They are generated by the movement of ions across the neuron membrane in response to a stimulus, and can travel along the length of a neuron to transmit information.
