Ch. 48 & 49 Flashcards
A neuron that transmits an impulse to the central nervous system after the neuron is stimulated by the environment is called
Sensory neuron
Which of the following is specifically a part or a function of the central nervous system
Integration
The part of a neuron that carries nerve impulses toward the cell body
A dendrite
Schwann cells produce
Myelin sheath
Which one of the following is a false statement about the resting membrane potential
The concentration of sodium is much higher inside the cell than outside
(It’s higher outside. 3 Na+ out. 2 K+ in.)
An action potential is
A traveling wave of depolarization in the neuron membrane
Which one of the following statements about the transmission across a typical chemical synapse is false
Vesicles containing neurotransmitter diffuse to the receiving cells plasma membrane
A natural pain reliever
Endorphin
Which one of the following structures are included in the peripheral nervous system
Afferent neurons
Which of the following are included in the mammalian forebrain
Thalamus
Hypothalamus
Cerebrum
Alex becomes so dehydrated while playing tennis that his blood pressure starts to drop. His _____ detects the drop in pressure and sends nerve signals to speed up the heart to compensate
Medulla oblongata
Regulates breathing, circulation, digestion
A man is admitted to the hospital suffering from an abnormally low body temp, loss of appetite, and extreme thirst. A brain scan shows a tumor in the ____
Hypothalamus
Regulates body temp, reproduction, and eating
The Limbic system is involved in
Emotion and memory
Which would be present in an animal with a nerve net?
Neurons
Which of the following is responsible for repolarization in an action potential
Opening of potassium gates
Opening of sodium gates is depolarization
In many animals the sequence of cells and neurons that receive and transmit information to produce a response to a stimulus is
Receptor Sensory Interneuron Motor Effector
A motor neuron axon (nerve fiber) that has a ______ will conduct information the fastest and produce the quickest reflex response to a stimulus
Large diameter and myelin sheath
Not a class of neurotransmitters
Polysaccharides
(Classes are: Acetylcholine Biogenic Amino acids Neuropeptides Gases)
_____ is solely an inhibitory type of neurotransmitter that causes ______ of the membrane of the receiving cell
GABA
hyperpolarization
(Acetylcholine is an excitatory NT that promotes depolarization)
Glial cells that fight infections in the nervous system
Microglia
