University:
Saint Louis University
Course:
HSI 3300 | Anatomy & Physiology I
Academic year:

2024
Views:

125

Pages:

1
Author:

Arlenette V.

Starting a Nerve Impulse ● ● ● Depolarization - a stimulus alters the neuron’s membrane A depolarized membrane permits sodium (Na+) to enter Ion exchange triggers an action potential in the neuron. The Action Potential ● If the action potential (nerve impulse) starts, it is propagated over the entire axon ● Potassium ions rush out of the neuron after sodium ions rush in, which repolarizes the membrane ● The sodium-potassium pump restores the original configuration ○ This action requires ATP Nerve Impulse Propagation ● The impulse continues to move toward the cell ● body impulses travel faster when fibers have a myelin sheath Continuation of the Nerve Impulse between Neurons ● ● ● ● Impulses are able to cross the synapse to another nerve Axon terminal release neurotransmitters The next neuron’s dendrite receptors react to them This starts an action potential The Action Potential ● If the action potential (nerve impulse) starts, it is propagated over the entire axon ● Potassium ions rush out of the neuron after sodium ions rush in, which repolarizes the membrane ● The sodium-potassium pump restores the original configuration ○ This action requires ATP Nerve Impulse Propagation ● The impulse continues to move toward the cell ● body impulses travel faster when fibers have a myelin sheath Continuation of the Nerve Impulse between Neurons ● ● ● ● Impulses are able to cross the synapse to another nerve Axon terminal release neurotransmitters The next neuron’s dendrite receptors react to them This starts an action potential Types of Reflexes and Regulation ● Autonomic Reflexes Smooth muscle regulation ○ Heart and blood pressure regulation ○ Regulation of glands Digestive system regulation ● Somatic Reflexes ○ activation of skeletal muscle