***HLSC 2410 EXAM 1 DETAILED QUESTIONS AND
VERIFIED SOLUTIONS GRADED A++
What is the function of a cell membrane?
to act as a selective barrier
What determines if a substance is soluble in water?
must be electrically attracted to water
What is the role of integral membrane proteins in the cell membrane?
allow for selective permeability of molecules
Competition between ligands at protein binding site is influenced by?
concentration and affinity
In facilitated diffusion, what happens?
polar ions are transported through membrane with a transporter/carrier
Mediated transport is subject to?
saturation of transporters used to diffuse the ions across the membrane
What determines the concentration difference of molecules between the
extracellular and intracellular domains of the cell?
the presence of
The movement of solutes and molecules across the cell membrane is dependent
on numerous factors. What factors affect the magnitude of the flux into or out the
cell through mediated transport>
saturation of binding sites
The resting membrane potential is regulated by?
, ion concentration
The diffusion of K+ across the cell membrane through channels:
increases the number of positive ions in the extracellular space
What does increasing the permeability of Na+ and Ca++ do to the membrane
potential?
depolarizes
What is a characteristic of a graded potential?
conducted with decrements
The administration of anesthetics:
increases action potential generation
Stimulus information is communicated from
a non efferent sensory receptor cell to an afferent sensory cell through neurotransmitter
release
The action potential frequency of a afferent sensory neruon conveys information
regarding the intensity of the stimulus
What are consequences of activation of sympathetic nervous system?
increased blood pressure, blood flow to muscles, glucose release to liver
Consciously planned movements are initiated in
higher level structures in the cortex
Motor programs are transmitter from
higher to lower levels of motor control hierarchy via descending pathways
Stretching of an extensor muscle activates what in order for the extensor muscle
to contract?
VERIFIED SOLUTIONS GRADED A++
What is the function of a cell membrane?
to act as a selective barrier
What determines if a substance is soluble in water?
must be electrically attracted to water
What is the role of integral membrane proteins in the cell membrane?
allow for selective permeability of molecules
Competition between ligands at protein binding site is influenced by?
concentration and affinity
In facilitated diffusion, what happens?
polar ions are transported through membrane with a transporter/carrier
Mediated transport is subject to?
saturation of transporters used to diffuse the ions across the membrane
What determines the concentration difference of molecules between the
extracellular and intracellular domains of the cell?
the presence of
The movement of solutes and molecules across the cell membrane is dependent
on numerous factors. What factors affect the magnitude of the flux into or out the
cell through mediated transport>
saturation of binding sites
The resting membrane potential is regulated by?
, ion concentration
The diffusion of K+ across the cell membrane through channels:
increases the number of positive ions in the extracellular space
What does increasing the permeability of Na+ and Ca++ do to the membrane
potential?
depolarizes
What is a characteristic of a graded potential?
conducted with decrements
The administration of anesthetics:
increases action potential generation
Stimulus information is communicated from
a non efferent sensory receptor cell to an afferent sensory cell through neurotransmitter
release
The action potential frequency of a afferent sensory neruon conveys information
regarding the intensity of the stimulus
What are consequences of activation of sympathetic nervous system?
increased blood pressure, blood flow to muscles, glucose release to liver
Consciously planned movements are initiated in
higher level structures in the cortex
Motor programs are transmitter from
higher to lower levels of motor control hierarchy via descending pathways
Stretching of an extensor muscle activates what in order for the extensor muscle
to contract?
