Atrial Contractions

Ashley asked:


A to cause atrial contractions
B.to act as a pacemaker and inatiate the heartbeat
C. to prevent valves from intervting durning the heart beat
D. to conduct impules from the Av node to the ventricles

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bluntastic1421 asked:


PLEASE ANSWER EVEN IF U KNOW ONE OF THEM THANK U!

1)In tubuloglomerular feedback , an increase in glomerular filtration rate would increase the _____, thereby stimulating the release of a paracrine factor from the macula densa that would_____.

a)Afferent arteriolar pressure: constrict the afferent arteriole
b)Afferent artiolar pressue: increase filtrate flow
c)Flow of tubular fluid : constrict the efferent arteriole
d)Flow of tubular fluid : constrict the afferent arteriole.

2) The contraction of the diaphragm results in a(n) ________
a)Decrease in the volume of the thoracic cavity and therefore a decrease in atmospheric pressure.
b)Decrease in the volume of the thoracic cavity and therefore a decrease in intra-alveolar pressure.
c)Increase in the volume of the thoracic cavity and therefore a decrease in intra-alveolar pressure.
d)None of above.

3) The mechanism that establishes the medullary osmotic gradient depends most on the permeability properties of the____
a)Glomerular filtration membrane
b)Collecting duct
c)Loop of Henle
d)Distal convoluted tube.

4) A diuretic agent, such as Lasix, works by which of the following mechanisms?
a)To prevent pH changes caused by organic acid.
b)To enhance atrial contractions.
c)To reduce blood pressure and blood volume by inhibiting sodium and water retention
d)To activate the renin-angiotensin mechanism.

5) Interferons ____
a)Act by increasing the rate of cell division
b)Interefere with viral replication within cells
c)Are virus specific, so that an interferon produced against one virus could not protect cells against another virus.
d)Are routinely used in nasal sprays for the common cold.

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