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PNB Bonus Exam Questions and
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Propagation of an action potential in a myelinated axon involves which of the following? ✔✔All of the above
The central nervous system includes the ______. ✔✔All of the above
The concentration of cation X(+) is 500mM inside the cell, and 100mM outside of the cell. Assuming that the membrane is permeable to X: ✔✔The equilibrium potential for X would be negative
The membrane is selectively permeable to all of the following EXCEPT: ✔✔oxygen
Activating a muscarinic receptor coupled to which G protein would cause calcium to be released ✔✔G-Q
Sympathetic preganglionic neurons release the neurotransmitter _____ at synapses lactoed in ______. ✔✔ACh the collateral ganglia
An example of a closed-loop, positive feedback system is in the human body: ✔✔During childbirth
The phospholipid bilayer of the cell membrane is arranged so that the heads of the phospholipid molecule face the extracellular and intracellular fluids; and the hydrophobic tails face each other. ✔✔True
In response to drop in calcium levels _________ stimulates ________: an example of homeostasis ✔✔Parathyroid hormone: Osteoclasts
Following depolarization of the axon _______ gated _______ channels initiate neurotransmitter release. ✔✔Voltage; Calcium
Presynaptic inhibition involves a neurotransmitter which blocks channels at a(n) _______ synapse. ✔✔Ca+; axo-axonic
Dislocation of the shoulder is prevented by ✔✔Tone in the rotator
This tissue is specialized for tensile strength due to the presence of collagen fibers. ✔✔Dense regular connective tissue in tendons
Muscle contraction is inhibited when ✔✔Tropomyosin blocks binding sites on actin
Unlike action potentials, excitatory post-synaptic potentials (EPSPs) ✔✔Have variable amplitudes
Neurotransmitters molecules are stored in _______ that are located in the ______ ✔✔Vesicles; Axon terminals
Which region of the brain contains the cell bodies of neurons that produce ADH ✔✔The supraoptic region
Hodor: ✔✔Pick the first one:
Steroid Hormones ✔✔Are synthesized from cholesterol
During muscle relaxation, calcium returns to the sarcoplasmic reticulum via ✔✔Active Transport
A motor unit consists of a single motor neuron and multiple muscle fibers ✔✔True
Homeostatic control mechanisms _______ ✔✔Require an afferent pathway informing a control center a change in the environment
When skeletal muscles contracts actin filaments slide, causing the I bands to become shorter while the A bands remain the same width ✔✔True
LIKE the dorsal column system, the anterolateral system pathway ✔✔Carries sensory information
The primary motor cortex is located in the _____ lobe and the primary somatosensory cortex is located in the ________ ✔✔Frontal; Parietal
Cell bodies of ______ are found in the _______ ✔✔All of above
