Exam 3 Flashcards
T or F
The central nervous system (CNS) consists of the brain, the spinal cord, and most of the nerves in our fingers
F
T or F
Myelinated axons transmit nerve impulses (AP’s) more slowly than non-myelinated axons.
F
T or F
Axon terminals are the main receptive region of the neuron, while the dendrite(s) is the main secretory region.
F
T or F
The arrival of neurotransmitters at NT receptors on the post-synaptic neuron’s membrane opens voltage gated ion channels.
F
T or F
Most neurons receive both excitatory and inhibitory inputs from up to thousands of other neurons.
T
T or F
During depolarization, the inside of a neuron becomes less negative
T
T or F
Voltage-gated Ca+ channels open in response to a change in post-synaptic membrane potential
and participate in the generation and propagation of action potentials in a post-synaptic neuron.
F
T or F
Immediately after an action potential has peaked, K+ gates open along that particular patch of axon.
T
T or F
An IPSP causes depolarization of the post-synaptic neuron, making an action potential in that cell more likely to occur.
F
T or F
Our brains can send nervous messages to effectors in our hands, but our hands cannot send nervous messages to our brains.
F
T or F
By total number, there are more neurons in your brain and spinal cord than all the neurons in the entire rest of your body.
T
T or F
Saltatory Conduction propagates action potentials faster than Continuous Conduction.
T
Definition of Neuron
Large, highly specialized cells that transmit impulses from one part of the body to another
Definition of Astrocyte
Most abundant glial cell of the CNS; one function is physically support neurons
Definition of Schwann cell
Surround nerve fibers in the PNS and form myelin sheaths
