biochem/physio

[era]

A patient bites down rapidly on an unexpected hard surface while chewing .cessation of motor unit recruitment i jaw closing muscles is caused by stimulation of
a muscle spindles
b mucosal mechanoreceptors
c periodontal mechanoreceptors
d nociceptors in dental pulp
ans c.


which of the following explains why an increasing filling of the ventricle during diastole causes a more forceful heart beat?the incressed ventricular volume.
A.diminishes the refractory period of the ventricle.
B.incresses end-diastolic fiber length.
C.facilitates conduction in the heart.
D.produces a less than optimal load.
ans B.

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[IndianGraduate]

are u putting these questions up cuz ur confused or for the sake of informing others?

 

[dreamdental]

I think he needs some explanation for the answers.

 

[era]

I think he needs some explanation for the answers.

hey guy..answers are according to the answer key..i need some explanation ..

 

[monicabr]

1) C _ It is proprioceptive function of periodontal ligament.
2) B _ It is the Frank-Staling relationship. The greater the heart is filled during diastole, the greater will be the force of contraction of the cardiac muscle

 

[porcelain258]

in the second q. i think the reason is greater filling of the ventricle during diastole increases the preload on the heart which causes more forceful contraction

 

[porcelain258]

and the increased preload is ofcourse indicative of increased end diastolic fibre length

 

[dreamdental]

according to frank sterlings law increase lenght increased force.