Term 2 Chapter 4 Lesson 3 Flashcards
2 Types of Neurotransmitters
Exhibitory
Inhibitory
Resting Potential
-70 mv (No stimulus)
What is a Reflex Arc
A nerve pathway that consists of the sensory neurons, interneurons, and motor neurons.
What is a nerve impulse?
A nerve impulse is an electric charge travelling the length of the neuron.
Nerve impulse = Action potential
What is a neurotransmitter?
The chemical that diffuses across the synapse and it causes channels to open on the neighboring cell and create a new action potential.
What is a synapse?
The small gap between the axon and the dendrite of another neuron. A synapse is where vesicles release chemicals through exocytosis.
What is a threshold?
The threshold is a minimum stimulus when a cell is depolarized and reached -55mv, at this point, the action potential occurs.
What is the role of acetylcholine?
The transfer of acetylcholine simulates the muscles to move.
Explain the action potential
When a neuron reaches its threshold, action potential occurs - sodium channels open and the sodium channels close; later, potassium channels open and potassium goes out of the neuron and the neuron reaches the resting potential (-70 mv)
How might the reflex arc be completed before the brain interprets the event?
Even before the information reaches the brain, a single zaps back out from the spinal cord that tells the effectors, which are the muscles to move.
