How does a nerve impulse travel in our body?
How does a nerve impulse travel in our body?
Answer: A nerve impulse travels from the dendrite to the cell body and then along the axon to the nerve endings, the nerve impulse sets off the release of chemicals. Synapse is the gap between two nerves cells, across which impulse pass to reach the next nerve cell.
What is the name for a pathway through the nervous system from a stimulus to an effector?
reflex arc. a term used to describe a complete pathway through the nervous system from stimulus to response; the nervous system’s basic functional pathway; parts include: receptor, sensory neuron, CNS, motor neuron, effector.
What are the 6 steps in the pathway of a nerve impulse?
Terms in this set (6)
- Resting neuron: The plasma membrane at rest is polarized.
- Action potential initiation and generation: A stimulus depolarizes the neurons membrane.
- Action potential initiation and generation:
- Propagation of the action potential:
- Repolarization:
- Repolarization:
What is the first step in the pathway of a nerve impulse?
Nerve impulses begin in a dendrite, move toward the cell body, and then move down the axon. A nerve impulse travels along the neuron in the form of electrical and chemical signals. The axon tip ends at a synapse. A synapse is the junction between each axon tip and the next structure.
Where does the second event in the pathway of a nerve impulse occur?
If that graded potential is strong enough to reach threshold, the second neuron generates an action potential at its axon hillock. The target of this neuron is another neuron in the thalamus of the brain, the part of the CNS that acts as a relay for sensory information.
Which channel gets open up after a stimulus is applied?
The opening of sodium channels allows nearby sodium channels to open, allowing the change in permeability to spread from the dendrites to the cell body.
What factors influence how fast nerve impulses travel?
The speed is affected by 3 factors:
- Temperature – The higher the temperature, the faster the speed.
- Axon diameter – The larger the diameter, the faster the speed.
- Myelin sheath – Only vertebrates have a myelin sheath surrounding their neurones.
What two factors affect impulse?
Two factors that influence the speed of an impulse are the axon diameter and the existence of a myelin sheath.
When a maximal response of the nerve is reached What does this mean in terms of physiology?
compound action potential
What is synapse in nervous system?
Synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction.
Which neurotransmitter is involved in the fight or flight response?
Catecholamines are the primary mediators of the fight-or-flight response. Norepinephrine is the major neurotransmitter in the peripheral sympathetic nervous system, whereas epinephrine is the primary hormone secreted by the adrenal medulla.
How do you avoid freezing in stressful situations?
Five Coping Skills for Overcoming the Fight, Flight or Freeze…
- What’s Happening, Neurologically Speaking:
- Deep Breathing or Belly Breathing.
- Grounding Exercises.
- Guided Imagery or Guided Meditation.
- Self Soothe Through Temperature.
- Practice “RAIN.”
Does anxiety cause brain freeze?
Most knee-jerk, impulsive reactions during an anxiety attack are the result of your brain’s amygdala, screaming “fight-flight-freeze!”
Why is my brain shutting down?
Brain fog can be a symptom of a nutrient deficiency, sleep disorder, bacterial overgrowth from overconsumption of sugar, depression, or even a thyroid condition. Other common brain fog causes include eating too much and too often, inactivity, not getting enough sleep, chronic stress, and a poor diet.