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The cells of the retina in which action potentials are generated are the?
Wiki User
∙ 14y ago
ganglion cells
Wiki User
∙ 14y ago
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How do the waves of depolarization generated by the autorhythmic cells spread to the muscle cells?
Gap Junctions in the cell spread the action potential to nearby cells.
What kind of cells are excitable?
Nerve, cardiac and muscle cells have action potentials.
Why do highly active cells have large number of mitochondria?
Mitochondria are required to regenerate rhodopsin (the pigment that absorbs photons in rod cell membranes) and also for the active transport of ions needed for action potentials to be generated and hence an impulse to occur
What nerve carries the action potentials from the ganglion cells to the thalamus of the brain?
The optic nerves carry the impulses from the eyes to the visual area of the thalamus.
What is the light-sensitive layer of cells at the back of the eye?
The retina (6 words) is this for a cross word by any chance?
Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes?
No
What cells have the ability to respond to stimuli by generating signals such as action potentials?
neurons and muscle cells
Where is action potential specifically found?
Action potentials are found on muscular or neural cells. The propagate along the cells's membrane surface.
Can neuroglia cells transmit action potentials from one nerve cell to another?
No.
Myocardial cells can generate action potentials spontaneously because they have?
unstable ion channels
What are pacemaker potentials and the action potential they trigger?
Pacemaker potentials are automatic potentials generated and are exclusively seen in the heart. They arise from the natural "leakiness" of the membrane that pacemaker cells have, resulting in passive movement of both Na+ and Ca2+ across the membrane, rising the membrane potential to about -40mV. This results in a spontaneous depolarization of the muscle that has a rise in the curve that is nowhere near as steep as the action potential of other cells. Upon depolarization, the cell will return back to its resting membrane voltage, and continue the potential again.
What nerve is composed of axons of the ganglion cells and transmits action potentials the thalamus of the brain?
Optic nerve
Why rod cells require large number of mitochondria?
Mitochondria are required to regenerate rhodopsin (the pigment that absorbs photons in rod cell membranes) and also for the active transport of ions needed for action potentials to be generated and hence an impulse to occur
How do the waves of depolarization generated by the autorhythmic cells spread to the muscle cells?
Gap Junctions in the cell spread the action potential to nearby cells.
What you mean by autorhythmicity?
The pacemaker is known as the SA node (sinotrial) and it generates action potentials to the AV node and then to the bundle of his down to the purkinje fibers. The branching of cardiac muscle tissue and the intercalated discs allow action potentials to propagate to other cardiac mt cells. The autorhythmicity of the heart is attributed to the fact that it creates its own action potentials from the SA node and can be generated independently from the rest of the body. The heart's autorhythmicity also prevents it from reaching tetanus (like a skeletal muscle does), because myocardial tissue only allows a certain amount of action potentials through before it reaches its absolute refractory period when it comes to a plateau and after the wave drops again and gets hit with another action potential it has already rested.
What kind of cells are excitable?
Nerve, cardiac and muscle cells have action potentials.
Why is the retina dependent on glucose?
The cells of the retina need glucose to get energy through a process called cellular respiration. Without glucose to the cells of the retina you can't see and the cells of the retina can't function.
