MAP Nerve System

Front

Masses of myelinated nerve fibers appear

Back

white.

Front

Which of the following lists the parts of a reflex arc in the correct sequence? receptor, sensory neuron, motor neuron, interneuron, effector, effector, receptor, sensory neuron, motor neuron, interneuron, effector, sensory neuron, receptor, interneuron, motor neuron, receptor, sensory neuron, interneuron, motor neuron, effector

Back

receptor, sensory neuron, interneuron, motor neuron, effector

Front

When a nerve fiber is polarized, the concentration of sodium ions is higher on the outside of its membrane and potassium ions is higher on the inside.

Back

sodium ions is higher on the outside of its membrane and potassium ions is higher on the inside.

Front

The most rapid nerve impulses are conducted on fibers that are

Back

thick and myelinated.

Front

The nervous system
Options: detects changes in the internal or external environment., controls the movement of muscles and secretions of glands., integrates information from several sources and uses it to make an appropriate response., All of these are correct.

Back

All of these are correct.

Front

What is the correct sequence of these events that follow a threshold potential?
(1) The membrane becomes depolarized.
(2) Sodium channels open and sodium ions diffuse inward.
(3) The membrane becomes repolarized.
(4) Potassium channels open and potassium ions diffuse outward.

Back

2, 1, 4, 3

Front

When an action potential passes over the surface of a synaptic knob, the contents of the vesicles are released in response to the presence of

Back

calcium ions.

Front

Myelin is defined as

Back

a lipoprotein cell membrane on the outside of axons.

Front

An immune response that triggers an inflammation of the spinal cord and brain, leaving scars is called

Back

multiple sclerosis

Front

Which of the following is under voluntary control of the nervous system? smooth muscles, glands, cardiac muscle, skeletal muscle

Back

skeletal muscle