Anaphy Quiz 2 (Nervous) Flashcards
(67 cards)
Nervous system classifications are based on:
▪ Structures (structural classification)
▪ Activities (functional classification)
What consists of the CNS
- Brain
- Spinal Cord
Function:
▪ Integration; command center
▪ Interprets incoming sensory information
▪ Issues outgoing instructions
fibers carry information from
the skin, skeletal muscles, and joints
Somatic sensory (afferent)
carry impulses to and from the brain
Cranial nerves
What consists of the PNS
- Spinal Nerves
- Cranial nerves
Function:
Serve as communication lines among sensory organs,
the brain and spinal cord, and glands or muscles
carry impulses to and from the spinal cord
Spinal nerves
Nerve fibers that carry information to the central
nervous system
Sensory (afferent) division
fibers carry information from
visceral organs
Visceral sensory (afferent)
Nerve fibers that carry impulses away from the central
nervous system organs to effector organs
Motor (efferent) division
2 Subdivisions of the Motor (efferent) division:
- Somatic nervous system
- Autonomic nervous system
Somatic or Autonomic?
Voluntary
Somatic Nervous System
Somatic or Autonomic?
Consciously (voluntarily) controls skeletal muscles
Somatic Nervous System
Somatic or Autonomic?
Automatically controls smooth and cardiac muscles and
glands
Autonomic Nervous System
Somatic or Autonomic?
Involuntary
Autonomic
Autonomic nervous system is further divided into what?
- Sympathetic Nervous System
- Parasympathetic Nervous System
The plasma membrane at rest is inactive or active?
Inactive
Major positive ion inside the cell
Potassium
Major positive ion outside the cell
Sodium
Are there more or fewer positive ions inside the neuron’s plasma than outside?
Fewer
As long as the inside of the membrane is more
negative (fewer positive ions) than the outside, the cell
remains inactive
In the resting state which is negative, outside or inside?
inside
In the resting state, the
external face of the membrane is slightly positive; its internal
face is slightly negative. The chief extracellular ion is sodium
(Na+), whereas the chief intracellular ion is potassium (K+). The
membrane is relatively impermeable to both ions.
The inward rush of sodium ions
Depolarization
A stimulus
changes the permeability of a local “patch” of the membrane,
and sodium ions diffuse rapidly into the cell. This changes the
polarity of the membrane (the inside becomes more positive;
the outside becomes more negative) at that site.
Depolarization
What is more positive in depolarization outside or inside?
inside
(click lang)
Depolarization and generation of an action potential.
If the stimulus is strong enough, depolarization causes
membrane polarity to be completely reversed, and an action
potential is initiated.
