Exam 11: Fundamentals of the Nervous System and Nervous Tissue

Strong stimuli cause the amplitude of action potentials generated to increase.

Match the following: A) Absolute refractory period B) Repolarization C) Action potential D) Depolarization E) Relative refractory period -An exceptionally strong stimulus can trigger a response.

Unipolar neurons have axons structurally divided into peripheral and central processes.

Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers.

Figure 11.2 Using Figure 11.2, match the following: -Synaptic vesicles.

The oligodendrocytes can myelinate several axons.

Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.

Match the following: A) Reverberating circuit B) Diverging circuit C) Converging circuit D) Parallel after-discharge circuit -One incoming fiber triggers responses in ever-increasing numbers farther and farther along the circuit.

Imagine a neuron that has several hundred axonal knobs impinging on it. The majority of these axonal knobs are shown to be "firing." However, the neuron in question does not transmit an impulse. Give a valid explanation of why this could occur.

The substance released at axon terminals to propagate a nervous impulse is called a(n) ________.

An impulse from one nerve cell is communicated to another nerve cell via the ________.

A second nerve impulse cannot be generated until ________.

A chemical messenger that does not directly cause ESPSs or IPSPs but does affect the strength of synaptic transmission is a ________.

Match the following: A) Trigger zone B) Receptive region C) Conducting region D) Secretory region E) Secretory zone -Receives stimuli.

Match the following: A) Absolute refractory period B) Repolarization C) Action potential D) Depolarization E) Relative refractory period -Also called a nerve impulse transmitted by axons.

Which of the following is not characteristic of neurons?

The autonomic nervous system is under voluntary control; whereas, the somatic nervous system is involuntary.

Figure 11.1 Using Figure 11.1, match the following: -Which neuron is common only in dorsal root ganglia of the spinal cord and sensory ganglia of cranial nerves?

Which of the following describes the nervous system integrative function?

Which of the following is not True of graded potentials?