Which conditions for viscosity and % of occlusion are required for increasing the volumetric flow rate during peristalsis in intestine?
Low viscosity and low % of occlusion
High viscosity and high % of occlusion
Low viscosity and high % of occlusion
High viscosity and low % of occlusion
What are the types of axonal transport in the nervous system?
Long and short axonal transport
Slow (bidirectional) and fast (unidirectional) axonal transport.
Fast(bidirectional) and slow(unidirectional) axonal transport.
Chemical and electrical axonal transport
Why is fetal hemoglobin different to adult hemoglobin?
Maternal blood in placenta has more o2 so fetal hemoglobin has higher affinity
Maternal blood in placenta has less o2 so fetal hemoglobin has lower affinity
Maternal blood in placenta has less o2 so fetal hemoglobin has higher affinity
Maternal blood in placenta has more o2 so fetal hemoglobin has lower affinity
Concerning a daughter vessel sufficiently small for not being considered important for perturbation of the flow in a bifurcation, which is the branching angle expected for the vessel with respect to the parent vessel?
45º50º
<20º
70º-90º
Cannot be determined
What happens in the carotid bifurcation when the crosssection increases in the outgrowth ?
Part if the flow goes through external carotid and some enters temporaly external carothid where the outgrowth is located and return before entering the internal carotid.
A positive pressure gradient is created.
The flow is divided in two and depending on the particles position they enter internal or external carotid
Which are the conditions for the lipidmediated transport to occur?
Low molecular weight and hydrophilicity.
Low molecular weight and high lipophilicity or lipid solubility.
Lipophilicity and high number of hydrogens bonds.
Low molecular weight and presence of specific carriers.
Which mechanisms allow a correct oxygen supply to the embryo?
Higher affinity and higher concentration of fetal hemoglobin
Bohr effect
Uterus contractions
Choose the correct answer
Viscosity is always inversely proportional to vessel diameter.
Pressure is higher in capillaries than in arteries.
When a blood vessel divides in two equal branches, both form the same angle with the original.
Blood flow is directly proportional to radius square.
Why is the zebra fish ideal for research projects?
Because it's cheaper than mice
Because we know its genome
Because its life cycle is short
Which ion causes the depolarization phase and which ion causes the repolarization phase?
Na+ causes the depolarization and K+ the repolarization
K+ causes the depolarization Na+ causes the repolarization
What are the differences between diffusion and facilitated diffusion?
Facilitated diffusion decreases the rate of diffusion and their carriers can be saturated
Facilitated diffusion is an active transport in which carriers can not be saturated whereas diffusion is a passive transport
In diffusion the molecules pass directly and the rate of diffusion is linear with concentration whereas facilitated diffusion carriers increase the rate of diffusion
The rate of diffusion in facilitated diffusion is linear with the concentration
Which are the main physical mechanisms used by the dialyzer membrane when filtering solute from blood?
Only diffusion.
Diffusion, convection and adsorption.
Osmosis and hydrostatic pressure.
None of the above
Why is inflammation dangerous for the blood brain barrier?
Because it prevents passage of substances.
Because it may provoke a myocardial infarction.
Because it provokes apparition of gaps and harmful substances may leak.
Because it increases blood flow rate.
What is the most important factor that determines how much O2 binds to hemoglobin?
Acidity
P(O2)
P(CO2)
BPG
What kind of transport requires Energy in the form of ATP to function properly?
Diffusion
Passive Transport
Active transport
Which transport mechanism in the blood brain barrier is triggered by an electrostatic interaction between a positively charged substance and a negatively charged plasma membrane surface?
Carrier-mediated efflux
Bulk-phase endocytosis
Receptor-mediated endocytosis
Absorptive-mediated transport
How does the O2 pressure in the blood flow of an interstitial fluid vary when doing exercise respect to the normal state?
The O2 pressure will be lower than in the normal state.
The O2 pressure will be higher than in the normal state.
The O2 pressure variation will not be significant respecting the normal state.
