Chapter 8: Nervous system Questions

What nervous system provides involuntary regulation of smooth muscle , cardiac muscle, and glandular activity

Autonomic system

The part of the peripheral nervous system that brings information to the CNS is the...?

afferent division

The all-or-non principle states that

all stimuli great enough to bring the membrane to threshold will produce identical action potentials

The glial cells responsible for maintaining the blood-brain barrier are the

astrocytes

The Brain and Spinal Cord comprise the..?

central nervous system

What Does opening of voltage gated sodium channels in the membrane of a neuron results in what...?

depolarization

What neuroglial cells produce CSF in some regions of the brain

ependymal cells

All of the Nervous Tissue outside of the CNS comprises what nervous system?

peripheral

When a neuron is at rest which ion passes through its membrane most easily?

potassium

Which of the Following is a Function of the Efferent Division of the Nervous System?

sending signals to nervous system

most neurons in the brain are

multipolar

The resting potential of a neuron id

-70mV

Action Potentials steps in Order

1. depolarization 2. activation of sodium channels and rapid depolarization 3. inactivation of sodium channels and rapid depolarization 4. closing of potassium channels

a stimulus that opens gated potassium ion channels, taking the membrane potential away from 0 mV, results in which of the what?

hyperpolarization

The small phagocytic cells which are derived from white blood cells are called...?

microglia

Most neurons lack centrioles. what does this observation explain?

why such neurons cannot divide through mitosis