Exercise Physiology quiz 3 Motor Units

In depolarization, ______________; while in repolarization, _____________

Na+ rush into cell; diffusion of K+ out of cell

Which ion transporter is engaged at rest to maintain resting membrane potential?

Na+-K+-ATPase pump

Which region of the nerve cell integrates all incoming EPSPs and IPSPs?

axon hillock

If someone is having trouble passing a roadside sobriety test (walk the line, touch the nose, etc.), which region of the brain is affected?

cerebellum

Receptors on the motor end plates of the neuromuscular junction are a special subtype of __ receptors, meaning that they bind the primary neurotransmitter involved in excitation of muscle fibers, acetylcholine

cholinergic

During depolarization, the membrane potential voltage

gets closer to 0

The fastest impulses travel on axons that are

myelinated and large

A(n) synapse is the junction between two neurons where an action potential is passed from the _____ to the ____ .

presynaptic cells; postsynaptic cells

The decision to voluntarily move your arm comes from which part of the brain?

primary motor cortex

Based on the definition of white mater and grey matter, what do you think whether the corpus callosum is a white matter or a grey matter?

white matter