Lateral ventricle Interventricular foramen of Monro Third ventricle Cerebral aqueduct of Sylvius fourth ventricle exits trough the median foramen of Magendie or the lateral foramen of Luscka Subarachnoid spaces in the cisterna magna, spinal cord subarachnoid space of the brain superior sagittal sinus
The synchronized opening and closing of Na + and K + gates result in the movement of electrical charges that generates a nerve impulse or action potential.
Action potentials reach the end of each neuron where these electrical signals are either transmitted directly to the next cell in the sequence via gap junctions, or are responsible for activating the release of specialized neurotransmitter chemicals.
An action potential at one node of Ranvier causes inwards currents that move down the axon, depolarizing the membrane and stimulating a new action potential at the next node of Ranvier.
What is saltatory conduction? An action potential at one node of Ranvier causes inwards currents that move down the action, depolarizing the membrane and stimulating a new action potential at the next node of Ranvier.
Reflex Arc The reflex arc is a hard wired, unconscious rapid response to external stimulus involving spinal nerves and effector cell. A reflex is an automatic, involuntary response of an organism to a stimulus. The entire nervous system is composed of innumerable reflex arcs.
Hyperopia results from an axial length of the eye that is too short for the refractive power of the eye .
In this case, distant objects cannot be focused clearly because the focal point is at the back of the retina.
Astigmatism or “ghost vision” is when both far and near objects appear out of focus. This is because of the uneven diameter of the cornea (oblong-shaped). For light rays to focus precisely on the retina, the cornea usually needs to be more evenly round.