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Where are the leak channels located on a neuron and how do they contribute to the resting membrane potential?
Leak channels are located on the cell membrane of a neuron. These channels allow ions, such as potassium and sodium, to passively move in and out of the cell. This movement of ions helps to establish and maintain the resting membrane potential of the neuron, which is essential for its normal functioning.
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Voltage regulated channels can be found where?
Voltage-regulated channels can be found in excitable cells, such as neurons and muscle cells, where they help regulate the flow of ions across the cell membrane in response to changes in membrane potential. These channels play a crucial role in processes like action potentials in neurons and muscle contraction.
What allows ions to enter the neural cell?
Ions enter the neural cell through ion channels located on the cell membrane. These channels are selective to specific ions based on size and charge, allowing for the passage of ions like sodium, potassium, calcium, and chloride. Ion channels open and close in response to various stimuli, such as changes in membrane potential or binding of specific molecules.
What part of the muscle cell membrane contain acetylcholine receptors?
Acetylcholine receptors are located on the motor end plate of the muscle cell membrane. This specialized region is where the nerve cell communicates with the muscle cell, allowing for the initiation of muscle contraction in response to acetylcholine binding to its receptors.
In which membrane is the electron transport chain located?
The outer membrane is where the electron transport chain is located.
Where is the thylakoid membrane located within a plant cell?
The thylakoid membrane is located within the chloroplast of a plant cell.
Where are channels located?
Along the cellular membrane.
Voltage regulated channels can be found where?
Voltage-regulated channels can be found in excitable cells, such as neurons and muscle cells, where they help regulate the flow of ions across the cell membrane in response to changes in membrane potential. These channels play a crucial role in processes like action potentials in neurons and muscle contraction.
What allows ions to enter the neural cell?
Ions enter the neural cell through ion channels located on the cell membrane. These channels are selective to specific ions based on size and charge, allowing for the passage of ions like sodium, potassium, calcium, and chloride. Ion channels open and close in response to various stimuli, such as changes in membrane potential or binding of specific molecules.
What is the system of membrane bound channels located throughout the cytoplasm in a eukaryotic cell?
the endoplasmic reticulum
Describe gating mechanism existing in channels?
Gating mechanisms in channels refer to the processes that regulate the opening and closing of ion channels in cell membranes. These mechanisms can be classified into two main types: voltage-gated and ligand-gated. Voltage-gated channels open or close in response to changes in membrane potential, while ligand-gated channels open or close in response to the binding of specific molecules, such as neurotransmitters. These gating mechanisms play a crucial role in controlling the flow of ions across the cell membrane, which is essential for various physiological processes, including nerve signaling and muscle contraction.
What happens to the membrane potential of a neuron during an action potential?
1. A neurotransmitter (NT) released from another cell (or in some cases the same cell) will diffuse across the synaptic cleft and bind to a recipient receptor. 2. The receptor will then change it's permeability to certain ions in the extracellular fluid, allowing the ions to flux into the cell (the exception here would be pharmacological agents designed to occupy the receptor without leading to a conformation change) 3. The influx of ions will alter the membrane potential. If the NT is inhibitory (e.g. GABA), then the GABA receptor that it binds to will increase its permeability to negatively charged ions (chloride) and thereby lower the local resting membrane potential (which is normally -70mV). If the NT is excitatory (e.g. glutamate) then the glutamte receptor (AMPA or NMDA) will increase its permeability to positively charged ions (sodium) which will increase the resting membrane potential from -70mV. 4. If enough NTs bind then the local membrane potentials will summate - and in the case of excitatory NTs - cause the membrane potential to change (by opening of voltage-gated ion channels) to around 0-20mV leading to an action potential 5. The action potential, which is generated in an 'all or none fashion' at the axon hillock, will then propagate all the way down the axon to the axon terminal causing the release of stored NTs (although not all NTs are stored - e.g. NOS) 6. NTs released from the presynaptic cell will then diffuse across the synaptic cleft and bind their postsynaptic receptor (normally located on a dendrite, although also located on the cell body themselves) and the whole process starts all over again
What molecules located in the membrane assist with facilitated diffusion?
Protein channels and carrier proteins are molecules located in the membrane that assist with facilitated diffusion. These proteins help facilitate the movement of specific molecules such as ions, sugars, and amino acids across the cell membrane.
What part of the muscle cell membrane contain acetylcholine receptors?
Acetylcholine receptors are located on the motor end plate of the muscle cell membrane. This specialized region is where the nerve cell communicates with the muscle cell, allowing for the initiation of muscle contraction in response to acetylcholine binding to its receptors.
Does endoplasmic reticulum contain a membrane?
The endoplasmic recticulum (ER) is located inside the cell, so it would be enclosed within the cell membrane. It contains a system of interconnected channels called cisternae enclosed by the unit membrane. ER is continuous with the outer membrane of the nuclear envelope and therefore is a membranous organelle.
In which membrane is the electron transport chain located?
The outer membrane is where the electron transport chain is located.
Where is the thylakoid membrane located within a plant cell?
The thylakoid membrane is located within the chloroplast of a plant cell.
What is the colloid that is located between the cell membrane and the nuclear membrane?
cytoplasm
