Nervous tissue Flashcards
The parts of the nervous system, particularly the CNS, with a high concentration of cell bodies are called ________________, while the areas with a high concentration of axons are called _______________
gray matter; white matter
The part of a neuron that receives information from another cell is/are the ________________, while the ______________ is/are the long fiber(s) that send(s) out information to another cell.
dendrites; axon
The central nervous system (CNS) is composed of
The brain and spinal cord
Automatic motor functions, such as blood pressure, pulse rate, gland secretions, and involuntary breathing are all regulated by the ________________ nervous system.
autonomic
The part of the nervous system that RECEIVES information is the ____________ portion.
sensory
The sodium/potassium pump is important because it
all of the above
Characteristics of ion channels include all of the following EXCEPT:
Ion channels can ONLY respond to hormones and neurotransmitters
hormones and neurotransmitters
ligand-gated
changes in voltage
voltage-gated
physical distortions of the membrane
mechanically gated
random
leakage channels
The electrical charge of a cell on the inside of the cell membrane relative to the outside of the cell is called the
membrane potential
The advantage of saltatory conduction in myelinated neurons is that
significantly faster than continuous conduction
Action potentials are “one-way” because:
the refractory period prevents them from going backwards
the minimum signal strength required to trigger an action potential
threshold stimulus
