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