What is meant by the term "chemically gated sodium channel"? group of answer choices a membrane channel that opens when some chemical binds to it, allowing sodium to cross the cell membrane a membrane channel that opens when sodium binds to it, allowing neurotransmitter to enter a cell a membrane pump that moves 3 sodium ions out of the cell using atp a membrane channel that opens when sodium binds to it, allowing potassium to leave the cell.
A membrane channel that opens when some chemical binds to it, allowing sodium to cross the cell membrane
Channels are integral membrane proteins that are involved in facilitated diffusion of specific, small, inorganic ions across the membrane. A chemically gated channel is also known as a ligand-gated channel. These channels open and close in response to the binding of a chemical or ligand. Here, the ligand serves as a stimulus to trigger the opening and closing of the channels. A chemically gated sodium channel would open and close when a specific ligand binds to it. Some of the examples of ligands are hormones, neurotransmitters, ions, etc.
A membrane channel that opens when some chemical binds to it, allowing sodium to cross the cell
Chemically gated sodium channels are transmembrane channel proteins which let sodium ion pass through the membrane when a ligand like a neurotransmitter binds to it.
On exciting a presynaptic neuron, it releases neurotransmitter from vesicles into synaptic cleft. The neurotransmitter binds to receptors present on post synaptic neuron. If the receptors are chemically gated channels, they undergo a confirmational change due to which they open. The ions can then flow across these channels.
The channels are made of at least two domains. There is a transmembrane domain containing a pore through which ions can pass through. There is also an extracellular domain which binds to the ligand.
⇒The composition , decomposition or displacement of molecules of matter during chemical change is called chemical reaction.
Various conditions bring about these changes. The chemical reactions are represented by chemicalequation. The compounds or elements that take part in chemical reaction are called reactant. They are written at the left side of an arrow that represent a change while the compound or elements that formed after the chemical change are called product. They are written at the right side of the arrow.
When nitrogen reacts with hydrogen to form ammonia :
Nitrogen + Hydrogen ⇒ Ammonia
N₂ + 3H₂ ⇒ 2NH₃
Presentation of a chemical reaction in the form of equation is called chemical equation . Chemical equation may be word equations or formula equations.
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