Apologia Advanced Biology Module 7 | Baamboozle - Baamboozle

What do schwann cells do?

They insulate the axons in the PNS, so the action potential can travel more efficiently

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Give an examples of where these circuits might be found. Convergent, divergent, oscillating

convergent-many inputs to one motor neuron (your biceps) divergent-one sensor on the skin sends a signal to the brain and to the muscles. oscillating-breathing,

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If neurons can’t perform mitosis, where do brain tumors come from?

The glial cells (neuroglia) a tumor is an overgrowth of cells (p203)

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If a stimulus causes an all or nothing action potential, how can we feel the difference between something warm and something hot?

The frequency of the action potentials

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Why can’t oligodendrocytes heal neurons in the CNS?

Oligodendrocytes cover many neurons, many schwann cells cover one neuron, so the schwann cells can create a path for the axon to regrow.

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What is Saltatory conduction?

(from the Latin saltare, to hop or leap) is the propagation of action potentials along myelinated axons from one node of Ranvier to the next.increased velocityo

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What do neurotransmitters do?

They pass an action potential across a synapse. Neuron to neuron or neuron to muscle (p211)

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What is the difference between the afferent and efferent nervous system?

Afferent receives information from sensory receptors to the CNS, Efferent sends information from the CNS to the effector organs

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Does the sodium potassium pump require energy? If so why?

Yes because it is pumping ions from areas of low concentration to areas of high concentration.

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Why might a stimulus not result in an action potential.

the stimulus was sub threshold or it occurred during the absolute refractory period

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Compare the maximum potential difference of each action potential when you tough something hot vs something warm?

no difference, action potentials work on the all or nothing principle

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Are there more neurons or neuroglia (glial cells)?

Neuroglia 9:1 according to the book, 10:1 according to the video.

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Why is it important that we have an intact blood brain barrier? What cells do this for us?

Many normal substances in the blood are toxic to neurons, astrocytes.

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