physio biochem doubts

[docsmiley]

what sensory unit is responsible for tone of skeletal muscle?
1.muscle spindle
2.golgi tendon
3 sarcomere
4pacinian corpuscles.
this is in 2002unreleased paper..



what best describes hydroxyapatite.
1.it has 12 ions per cell
2solubility decreases as H ion increases
3.it has an amphilic surface
4.it has no ion substitutions in bone and enamel
5.it has higher solubility product constant than fluorapatite



which enzyme does not need a primer..
1.dna ligase.
2 rna polymerase
3.dna polymerases 1 , 2 and 3.

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[missiondds]

hi friends,
wat increases the strength of heart muscle contractn-
increase e/cellular calcium or increases i/cellular calcium...
decks say e/cellular increase in calcium....is it rigt...
im confused....wont calcium go i/cellularly to increase the actin myosin cross bridging??????????
sum1 please explain....
thanks...

hi.. its pretty simple... just like chain rxn. 1 unit of e/cellular ca will enter the myocardial cells and cause multiple units of i/cellular ca to be rleased fr SR...

so whn u increase the e/cellular ca, automatically leads to increase in numerous i/cellular ca n M.CONt.however e/cellular ca is NEEDED for the release of intracellular ca.

 

[missiondds]

what most immeiately leads to dissociation of actomyosin complex-
1,atp hydrolysis
2.release of atp hydrolytic products
3.atp replacing adp on myosin heads
4.tilting of myosin heads.

not sure...its either 1 or 3

i think its 3.

simply, coz... actinomyosin complex is disloged only when the adp+pi bound to AMcomplex is replaced by ATP molecule...

 

[njsmahal]

most of the calcuim in human body is excreted through sweat.

coronary artries are dilated maximally (filled with blood) during early diastole. 70% of coronary vessels are filled during diastole and 30% during systole.

most of calcium excretion is through feces ( 1:0.47 ration of feces and rest of the body)
and i read somewhere its late diastole during which there is maximum filling.

 

[missiondds]

hi..wats the difference between oxygen tension and oxygen content of arterial blood?
in anemia, both vl be reduced????????????or one of them????
thats a board question....

I anemia only oxygen content ll be reduced not the tension.

oxygen content of the gas depends soley on the oxygen carrying capcity of rbcs.

 

[missiondds]

hey guys..
thanx so much for the answers ....
so, in anemia, o2 tension reduces but o2 content is unchanged..rite????
also,
what is true about g proteins..
1.theyr membrane proteins.
2 they r tightly bound to adenyl cyclase
3 they act on steroid hormones
4.catalyse diacylglycerol production


also, how is arterial compliance reduced by stressful experience????

Gproteins are transmembrane proteins consisting of alpha/beta/gamma subunits. whn an hormone binds to a recptor on cell surface via gprotein mechanism.. it causes confromational change in the gprotein causin the alpha subunit to dissociate frm the remain 2 subunits. the alpha sunbuits binds to gtp.. this causes activation of andynalte cyclase in cell membrane which activates/inhibits camp finally to release a secondary messenger that brings about the desired effect in cell.

 

[kupra]

ph of soln A is 7 and of soln B is 6.
what is true of both solns-
1.soln A HAS 1/10 H IONS THAN B
2.SOLN A HAS 10 TIMES H IONS THAN SOLN B
3 .SOLN A HAS 6/7 H IONS
4 SOLN A HAS 7/6 H IONS




1.soln A HAS 1/10 H IONS THAN B is correct as change in 1 ph unit reuth in 10 fold change in the acid and base ratio.

 

[kupra]

what most immeiately leads to dissociation of dissociation of -
1,atp hydrolysis
2.release of atp hydrolytic products
3.atp replacing adp on myosin heads
4.tilting of myosin heads.

3 is correct .....atp hydrolysis reset the myosin head for next cycle.......atp replacing adp result in immeiate dissociation.

 

[missiondds]

most of calcium excretion is through feces ( 1:0.47 ration of feces and rest of the body)
and i read somewhere its late diastole during which there is maximum filling.

the question asks about whn are the CORONARY VESSELS DILATED/FILLED.so its the early diastole where maximum filling takes place i am mentioning this information after having read frm sherwood.. there is a graph plotted in this book to expalin the filling of coronary vessels during the entire diastole.. with a huge bump at early systole. i think i am pretty sure.pls lemme know the source of u r info.

 

[missiondds]

oral tuberculosis vl occur by which route-
1.primary inoculation by contaminated instruments
2.sputum entering the mouth
3lymph spread
4 hematogenous spread.

answer 4: hematogenous spread. primary tuberculosis only the LUNG is the site. desimination would result in various sites like bone/breast/ brain/ oral region.

sputum entering the mouth is wrong answer coz of the potent antimicrobial n defense mechanisms of salive which prevent colonization. nasopharnx could be the route only in primary by inspiring infectious droplets.

 

[niti12]

d amino acids and n acetyl muramic acids are found in which of the following?
1.outer membrane of gram -ve organisms
2.teichoic acid of gram +ve
3.lipopolysaccharide of gram -ve
4.cytoplasmic membrane of gram +ve
5.peptidoglycan of gram -ve and +ve organisms

 

[njsmahal]

d amino acids and n acetyl muramic acids are found in which of the following?
1.outer membrane of gram -ve organisms
2.teichoic acid of gram +ve
3.lipopolysaccharide of gram -ve
4.cytoplasmic membrane of gram +ve
5.peptidoglycan of gram -ve and +ve organisms

god help me

 

[dental material]

god help me

Hi njsmahal , u r doing great
dont get panic , u know almost all things and moreover u know concepts

all the best

 

[njsmahal]

Hi njsmahal , u r doing great
dont get panic , u know almost all things and moreover u know concepts

all the best

thanks for the good wishes... fingers crossed