Lecture 20
Which cation is found most abundantly inside and outside the cell? (2 answers)
Outside: Na+
Inside: K+
What is the type of summation in which EPSPs from multiple sites are summated to produce an AP?
Do rapid adapting or slow adapting receptors produce persistent stimuli?
Slow adapting
The prefix "somato" implies that the neuron involves this type of tissue
skeletal muscle
What two neurotransmitters do adrenergic neurons release?
Epi and NE
Which types of channels are passive requiring no energy? (2 classes)
Leak channels
Gated-channels
Name 2 of the 3 ways that neurotransmitters can be removed for the NMJ
Diffusion
Enzymatic degradation
reuptake by presynaptic cell
Which type of sensory neurons have free nerve endings?
Where does decussation occur for upper motor neurons?
medulla oblongata
Give 2 examples of cholinergic neurons
Preganglionic neurons (PNS and SNS)
PANS postganglionic neurons
Somatic motor neurons
Which anions are found most abundantly in intracellularly and extracellularly? (2 answers)
Intracellularly: proteins, phosphorus
Extracellularly: chloride
What is an example of an enzyme that breaks down neurotransmitters at the synaptic cleft?
What type of paralysis is seen with injury to the lower motor neuron?
flaccid paralysis
What are two other synonyms for ascending tracts?
Sensory tract / afferent tract
What are the two types of cholinergic receptors?
Muscarinic and Nicotinic
What is the threshold membrane potential?
-55mV
In which type of summation does ONE axon deliver many EPSPs?
Which tactile mechanoreceptors receives fine touch?
Meissner's corpuscles
Where do the 2nd and 3rd order neurons synapse?
Thalamus
In which spinal region do neurons from the SANS leave the spinal cord?
Thoracic region
What type of stimulus is needed for an action potential to occur during the relative refractory period?
Suprathreshold stimulus
In which type of tissue can electrical synapses be found?
Cardiac tissue
Which types of receptors are seen in musculoskeletal tissue? Name 2 of 3
Nociceptors, muscle spindles, golgi tendon organs
What type of stimuli travels in the spinothalamic tract? Name 2 of the 4
pain, temperature, itch, tickle
Chromaffin cells