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What is an action potential in the nervous system?

An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a “spike” or an “impulse” for the action potential. The action potential is an explosion of electrical activity that is created by a depolarizing current.

Why do action potentials travel one direction?

So when an action potential depolarizes the membrane, the leading edge activates other adjacent sodium channels. But action potentials move in one direction. This is achieved because the sodium channels have a refractory period following activation, during which they cannot open again.

What happens to two colliding action potentials?

Answer: Colliding action potentials cancel each other out because the refractory period of either spike prevents the continuation of an impulse in either direction.

What happens as a result of ion flow at a presynaptic terminal?

What happens as a result of ion flow at a presynaptic terminal? Synaptic vesicles migrate to the plasma membrane and release acetylcholine.

What happens once a neurotransmitter is received by a postsynaptic neuron’s receptors?

Once a neurotransmitter is received by a postsynaptic neuron’s receptors, what happens? – An inhibitory message will keep the neuron from firing. – The cell body integrates the messages. – With an excitatory message, the neuron will be more likely to fire.

When Cara is two her parents?

When Cara is two, her parents learn that she has severe epilepsy that requires the removal of the right hemisphere of her brain. Given the research, which of the following is likely true? Cara will eventually regain most of the use of her limbs. Cara’s seizures will diminish.

What did Freud believe most influences our developing identity?

What did Freud believe most influenced our developing identity, personality and frailties? Lingering focus of pleasure-seeking energies at an early psychosexual stage. Ex: Over indulged or deprived individual might fixate at the oral stage and eat excessive or smoke for oral gratification.

What was the main point of Ivan Pavlov’s experiment with dogs?

Pavlovian theory is a learning procedure that involves pairing a stimulus with a conditioned response. In the famous experiments that Ivan Pavlov conducted with his dogs, Pavlov found that objects or events could trigger a conditioned response.

What brain structure allows this water polo player to coordinate his swimming and throwing as well as planning his next move?

Cerebellum

Why does a slap in the face hurt more than a slap on the back?

Given the organization of the primary somatosensory cortex, why does a slap in the face hurt more than a slap on the back? Sensitive areas on the body take up more space in the cortex and The cortex has more space devoted to the face than to the back. Alicia is being aggressively tickled by her older sister.

Which nervous system divisions are activating these responses?

Autonomic Nervous System Autonomic responses are mediated by the sympathetic and the parasympathetic systems, which are antagonistic to one another. The sympathetic system activates the “fight or flight” response, while the parasympathetic system activates the “rest and digest” response.

What are the two divisions of the nervous system?

The nervous system as a whole is divided into two subdivisions: the central nervous system (CNS) and the peripheral nervous system (PNS).

What are the 3 main divisions of the nervous system?

The central nervous system (CNS) is the brain and spinal cord, and the peripheral nervous system (PNS) is everything else (Figure 8.2).