Exam 26: The Nervous System

Figuer: -In the figure,the researchers measured a clam's ability to burrow as an indicator of paralysis due to inhibition of a Na⁺ transporter by saxitoxin.Which of the following would occur in sensitive clam cells that have been exposed to saxitoxin?

Damage to the pons would lead to problems with posture.

On an axon,the small spacings between the insulation surrounding the axon are called

If you wanted to surgically disrupt the part of a neuron which conducts the nerve impulse,you would cut what part of the neuron?

Impaired vision after a blow to the head implies damage to the vision processing center in the brain,which is what region?

Unmyelinated regions between adjacent myelin sheath cells are called synaptic clefts.

The division of the peripheral nervous system that carries signals to voluntary muscles is the _____ system.

The nervous tissue of the central nervous system that consists of neuron cell bodies and synapses is the

How would exposure to saxitoxin from algae cause changes in clam populations?

The division of the nervous system that integrates sensory information and coordinates the body's response is the _____ nervous system.

A nerve impulse does not spread backwards because of a refractory period in which the membrane reestablishes its resting potential and cannot generate another action potential.

The reason that we can tell light from sound is because different neurons transmit these different stimuli.

Nodes of Ranvier are intervals between Schwann cells that _____ the conduction of nerve impulses.

A neuronn must reach threshold potential before an action potential begins.

The three types of neurons in the nervous system of humans are

The connection point between an interneuron and a motor neuron is a synapse.

If you were trying to build a mechanical model of a neuron,in terms of magnitude and kind,while not transmitting a signal,you would want the model to have a(n)

A graded potential allows for variable,rather than all-or-none responses,in neurons.

A drug designed to stop neurons from recharging would block the step in which ions

The part of the neuron that is usually highly branched and receives input from other neurons is the